E220P-400T22S LoRa Module In-depth Analysis: Cost-effective Solution for Industrial Wireless Communication
chartloop · 3 天前 · 420 次点击Introduction
Against the backdrop of rapid growth in the global wireless communication module market, QYResearch shows that the global wireless module market size reached US$6.972 billion in 2025, and is expected to exceed US$10.36 billion by 2032, with a CAGR of 5.9%. Among them, Sub-1GHz industrial-grade communication modules, as core connectivity components for smart metering, industrial sensing, building automation and other scenarios, continue to see rising market demand. Chengdu Ebyte Electronic Technology Co., Ltd., a leading domestic provider of wireless communication solutions, relying on industry-university-research cooperation with universities such as University of Electronic Science and Technology of China and Southwest Jiaotong University, has launched the E220P-400T22S LoRa wireless module, which has become an ideal choice for industrial IoT scenarios with its low power consumption, long range and high reliability features.
Based on official manual parameters, this article comprehensively analyzes the technical features, application scenarios and deployment guidelines of the E220P-400T22S, providing selection references for industrial equipment developers.
Table of Contents
Core Product Features
Detailed Technical Specifications
Hardware Design and Pin Definition
Operating Modes and Function Description
Configuration Method and Register Description
Typical Application Scenarios
Frequently Asked Questions and Solutions
Selection Reference and Peer Comparison
1. Core Product Features
The E220P-400T22S is a new generation LoRa wireless serial port module designed based on the Semtech LLCC68 chip. Compared with the traditional SX1276 solution, it achieves comprehensive improvements in transmission distance, speed and power consumption. The core advantages are as follows:
Feature Category
Specific Parameters
Core Solution
Semtech LLCC68 LoRa chip
Operating Frequency Band
410.125 ~ 493.125MHz (default 433.125MHz)
Transmit Power
Maximum 22dBm, multi-level software adjustable
Communication Range
Up to 7km in ideal environment (5dBi antenna, 2.5m height, 2.4kbps rate)
Power Consumption Performance
Receive current 11mA, sleep current only 2μA
Reliability Design
Built-in PA+LNA, ESD protection, ±1PPM high-precision active crystal oscillator, industrial temperature range of -40℃~+85℃
Advanced Functions
Wake-on-air, carrier sense, communication encryption, RSSI signal strength detection
Interface Compatibility
UART TTL level, supports 3.3V/5V IO voltage, dual antenna options (IPEX/stamp hole)
This module supports parameter saving after power off, with built-in watchdog design, which can automatically restart under abnormal conditions to ensure long-term stable operation.
2. Detailed Technical Specifications
2.1 Absolute Maximum Ratings
Parameter
Minimum
Maximum
Remarks
Supply Voltage
2.3V
5.5V
Exceeding 5.5V will cause permanent damage
Operating Temperature
-40℃
+85℃
Industrial-grade design
Blocking Power
-
10dBm
Very low risk of burn-out for short-distance use
2.2 Operating Parameters
Parameter
Minimum
Typical
Maximum
Remarks
Supply Voltage
3.3V
5.0V
5.5V
≥5.0V ensures optimal output power
Transmit Current
-
110mA
-
@22dBm transmit power
Receive Current
-
11mA
-
Normal receive mode
Sleep Current
-
2μA
-
Software off mode
Receive Sensitivity
-132dBm
-135dBm
-136dBm
@2.4kbps air data rate
Air Data Rate
2.4kbps
2.4kbps
62.5kbps
Configurable via software
Transmit Packet Length
200Byte
-
-
Supports 32/64/128/200Byte sub-packet settings
Buffer Size
400Byte
-
-
Module Dimensions
16*26mm
-
-
SMD package, 1.27mm pin pitch
3. Hardware Design and Pin Definition
3.1 Pin Layout
The E220P-400T22S adopts a 22-pin SMD package. The core pin definitions are as follows:
Pin Number
Name
Direction
Function Description
1/2/3/4/11/13/19/20/22
GND
-
Power ground
5
M0
Input (weak pull-up)
Used with M1 to set operating mode, can be grounded if not used
6
M1
Input (weak pull-up)
Used with M0 to set operating mode, can be grounded if not used
7
RXD
Input
UART receive, connects to TXD pin of external MCU
8
TXD
Output
UART transmit, connects to RXD pin of external MCU
9
AUX
Output
Module operating status indicator, can be used to wake up external MCU, can be left floating if not used
10
VCC
-
Power input, 2.3~5.5V DC
21
ANT
-
Antenna interface, connects to 50Ω impedance antenna
12/14-18
NC
-
No connection pins, no need to connect
3.2 Hardware Design Notes
Power Design: It is recommended to use a DC regulated power supply with as small ripple coefficient as possible, reserve more than 30% power margin, and ensure reliable grounding of the module.
Wiring Specification: High-frequency digital traces, analog traces and power lines should avoid passing under the module. If necessary, lay copper on the contact layer of the module and ground it well.
Electromagnetic Compatibility: The module should be kept away from strong electromagnetic interference sources such as power supplies, transformers and high-frequency wiring, and maintain an appropriate distance from 2.4GHz devices such as USB 3.0.
Antenna Deployment: The antenna should be exposed as much as possible and vertically upward. If installed in a metal case, use an antenna extension cable to lead the antenna out of the case to avoid signal attenuation.
4. Operating Modes and Function Description
4.1 Operating Mode Switching
The module supports 4 operating modes, set by the level combination of M0 and M1 pins:
Mode
M1
M0
Function Description
0 (Normal Transmission Mode)
0
0
UART and wireless channel fully open, transparent transmission mode
1 (WOR Transmit Mode)
0
1
Supports wake-on-air, can send data to wake up devices in WOR receive mode
2 (WOR Receive Mode)
1
0
Wireless transmission off, only receives data, suitable for low-power battery-powered scenarios
3 (Deep Sleep Mode)
1
1
Cannot send/receive data, can enter register configuration mode
Mode switching takes effect 2ms after the AUX pin outputs high level. If the module is processing data, it will automatically switch to the new mode after data processing is completed.
4.2 Core Function Description
4.2.1 Fixed Transmission Mode
In fixed transmission mode, the module identifies the first 3 bytes of serial port received data as target address high byte + target address low byte + target channel, and only sends data to modules with the specified address and channel, realizing point-to-point directed communication.
4.2.2 Broadcast Transmission Mode
When the module address is set to 0xFFFF or 0x0000, as a transmitter, it can broadcast data to all modules under the same channel; as a receiver, it can monitor communication data of all modules under the same channel, suitable for group communication and network monitoring scenarios.
4.2.3 AUX Pin Function
The AUX pin is used to indicate the module operating status:
Low level indicates the module is busy (data transmission in progress, self-check initialization in progress), cannot switch operating mode
High level indicates the module is idle, mode switching and data transmission can be performed
When receiving data, AUX will pull low 2-3ms in advance to wake up the external MCU to prepare for data reception
5. Configuration Method and Register Description
The module needs to enter deep sleep mode (M1=1, M0=1) for parameter configuration, supports 9600bps 8N1 serial communication format. The core command formats are as follows:
Command Type
Send Format
Return Format
Example
Set Register
C0 + start address + length + parameters
C1 + start address + length + parameters
Set channel to 0x09: send C0 05 01 09, return C1 05 01 09
Read Register
C1 + start address + length
C1 + start address + length + parameters
Read channel: send C1 05 01, return C1 05 01 09
Temporary Set Register
C2 + start address + length + parameters
C1 + start address + length + parameters
Parameters are only valid for the current power-on cycle, restore default values after restart
5.1 Core Register Description
Address
Name
Function Description
00H-01H
ADDH/ADDL
Module address, default 0x0000, supports broadcast/monitoring when set to 0xFFFF
02H
REG0
Configure UART baud rate (1200~115200bps), parity bit, air data rate (2.4~62.5kbps)
03H
REG1
Configure sub-packet length (32/64/128/200Byte), RSSI noise detection switch, transmit power (10~22dBm)
04H
REG2
Channel setting, 0-83 corresponds to 410.125~493.125MHz, step 1MHz
05H
REG3
Configure RSSI byte output, transmission mode (transparent/fixed), LBT monitoring, WOR cycle (500~4000ms)
06H-07H
CRYPT_H/CRYPT_L
Communication encryption key, write-only, cannot be read, ensuring data transmission security
5.2 Factory Default Parameters
Parameter Item
Default Value
Operating Frequency
433.125MHz
Module Address
0x0000
Air Data Rate
2.4kbps
Serial Baud Rate
9600bps, 8N1
Transmit Power
22dBm
Transmission Mode
Transparent transmission
6. Typical Application Scenarios
The industrial-grade design of the E220P-400T22S makes it widely applicable to the following scenarios:
6.1 Smart Metering System
In remote water, electricity, gas and heat metering scenarios, the low-power feature of the module supports battery power supply, 7km communication range can cover large-scale residential areas, and encryption function ensures metering data security, greatly reducing manual meter reading costs.
6.2 Industrial Sensor Network
In factory environments, the module can connect to various temperature, humidity, pressure and liquid level sensors to realize wireless collection of production data. The anti-interference design ensures stable communication in complex electromagnetic environments, providing data support for industrial Internet platforms.
6.3 Building Automation
Used for wireless communication in intelligent lighting, elevator monitoring and fire alarm systems, avoiding complex wiring, supporting multi-node networking, and reducing construction difficulty and cost of building intelligent transformation.
6.4 Agricultural IoT
In field planting and livestock breeding scenarios, the module can connect to soil monitoring and environmental sensing equipment to realize remote data collection and equipment control. The low-power feature is suitable for field battery-powered deployment.
6.5 Intelligent Security System
Used for wireless anti-theft alarm, access control and video monitoring data backhaul. The long-distance communication feature is suitable for large-scale security deployment in parks and factories.
7. Frequently Asked Questions and Solutions
7.1 Short Communication Range
Possible Causes:
Obstacles, same-band interference, or metal objects near the antenna
Air data rate set too high (higher rate leads to shorter transmission distance)
Insufficient power supply voltage, resulting in reduced transmit power
Poor antenna matching or low-quality antenna
Solutions:
Elevate the antenna installation height as much as possible, avoid obstacles and interference sources
Reduce the air data rate, adjust the transmit power to the maximum value
Ensure the power supply voltage is ≥5V, use a regulated power supply
Replace a matched high-gain antenna, use an antenna extension cable when deployed inside a metal case
7.2 Module Easy to Damage
Possible Causes:
Power supply voltage exceeds 5.5V or reverse polarity connection
Unreleased static electricity causing chip breakdown
Operating environment humidity too high or temperature out of range
Solutions:
Add over-voltage and reverse polarity protection circuits, strictly control the power supply voltage
Implement electrostatic protection during installation and operation, ensure good module grounding
Avoid using in environments exceeding the -40℃~+85℃ range
7.3 High Bit Error Rate
Possible Causes:
Same-frequency signal interference nearby
Unstable power supply causing communication abnormalities
Antenna extension cable too long or poor quality
Solutions:
Switch the communication channel to avoid interference frequency bands
Optimize power supply design, add filter capacitors
Shorten the antenna feeder length, use low-loss coaxial cable
8. Selection Reference and Peer Comparison
8.1 Peer Product Parameter Comparison
Product Model
Core Chip
Transmit Power
Maximum Communication Range
Receive Current
Package Size
E220P-400T22S
LLCC68
22dBm
7km
11mA
16*26mm
E220-400T30S
LLCC68
30dBm
10km
12mA
18*28mm
Competitor SX1276 Module
SX1276
20dBm
5km
15mA
17*26mm
8.2 Matching Antenna Recommendations
Ebyte officially provides a variety of matching antennas for selection:
Antenna Model
Type
Gain
Application Scenario
TX433-JZ-5
Rubber Antenna
2.0dBi
Short-distance devices, handheld terminals
TX433-JK-20
Rubber Antenna
3.0dBi
Medium-distance transmission, fixed equipment
TX433-XPH-300
Suction Cup Antenna
6.0dBi
Long-distance transmission, outdoor deployment
About Ebyte
Chengdu Ebyte Electronic Technology Co., Ltd. is a national high-tech enterprise focusing on wireless communication applications. Its products cover the full range of wireless modules including LoRa, Bluetooth, Wi-Fi and 5G, which are widely used in industrial IoT, smart home, smart agriculture and other fields. The company has established technical cooperation with multiple universities around the world, and its products have passed international certifications such as FCC, CE and RoHS, and are exported to more than 160 countries and regions. It can provide customers with customized development and one-stop wireless communication solutions.
Official Website: https://www.cdebyte.com
Technical Support: [email protected]
Address: Building B5, Mould Park, 199 Xiqu Avenue, High-tech Zone, Chengdu, Sichuan, China
Against the backdrop of rapid growth in the global wireless communication module market, QYResearch shows that the global wireless module market size reached US$6.972 billion in 2025, and is expected to exceed US$10.36 billion by 2032, with a CAGR of 5.9%. Among them, Sub-1GHz industrial-grade communication modules, as core connectivity components for smart metering, industrial sensing, building automation and other scenarios, continue to see rising market demand. Chengdu Ebyte Electronic Technology Co., Ltd., a leading domestic provider of wireless communication solutions, relying on industry-university-research cooperation with universities such as University of Electronic Science and Technology of China and Southwest Jiaotong University, has launched the E220P-400T22S LoRa wireless module, which has become an ideal choice for industrial IoT scenarios with its low power consumption, long range and high reliability features.
Based on official manual parameters, this article comprehensively analyzes the technical features, application scenarios and deployment guidelines of the E220P-400T22S, providing selection references for industrial equipment developers.
Table of Contents
Core Product Features
Detailed Technical Specifications
Hardware Design and Pin Definition
Operating Modes and Function Description
Configuration Method and Register Description
Typical Application Scenarios
Frequently Asked Questions and Solutions
Selection Reference and Peer Comparison
1. Core Product Features
The E220P-400T22S is a new generation LoRa wireless serial port module designed based on the Semtech LLCC68 chip. Compared with the traditional SX1276 solution, it achieves comprehensive improvements in transmission distance, speed and power consumption. The core advantages are as follows:
Feature Category
Specific Parameters
Core Solution
Semtech LLCC68 LoRa chip
Operating Frequency Band
410.125 ~ 493.125MHz (default 433.125MHz)
Transmit Power
Maximum 22dBm, multi-level software adjustable
Communication Range
Up to 7km in ideal environment (5dBi antenna, 2.5m height, 2.4kbps rate)
Power Consumption Performance
Receive current 11mA, sleep current only 2μA
Reliability Design
Built-in PA+LNA, ESD protection, ±1PPM high-precision active crystal oscillator, industrial temperature range of -40℃~+85℃
Advanced Functions
Wake-on-air, carrier sense, communication encryption, RSSI signal strength detection
Interface Compatibility
UART TTL level, supports 3.3V/5V IO voltage, dual antenna options (IPEX/stamp hole)
This module supports parameter saving after power off, with built-in watchdog design, which can automatically restart under abnormal conditions to ensure long-term stable operation.
2. Detailed Technical Specifications
2.1 Absolute Maximum Ratings
Parameter
Minimum
Maximum
Remarks
Supply Voltage
2.3V
5.5V
Exceeding 5.5V will cause permanent damage
Operating Temperature
-40℃
+85℃
Industrial-grade design
Blocking Power
-
10dBm
Very low risk of burn-out for short-distance use
2.2 Operating Parameters
Parameter
Minimum
Typical
Maximum
Remarks
Supply Voltage
3.3V
5.0V
5.5V
≥5.0V ensures optimal output power
Transmit Current
-
110mA
-
@22dBm transmit power
Receive Current
-
11mA
-
Normal receive mode
Sleep Current
-
2μA
-
Software off mode
Receive Sensitivity
-132dBm
-135dBm
-136dBm
@2.4kbps air data rate
Air Data Rate
2.4kbps
2.4kbps
62.5kbps
Configurable via software
Transmit Packet Length
200Byte
-
-
Supports 32/64/128/200Byte sub-packet settings
Buffer Size
400Byte
-
-
Module Dimensions
16*26mm
-
-
SMD package, 1.27mm pin pitch
3. Hardware Design and Pin Definition
3.1 Pin Layout
The E220P-400T22S adopts a 22-pin SMD package. The core pin definitions are as follows:
Pin Number
Name
Direction
Function Description
1/2/3/4/11/13/19/20/22
GND
-
Power ground
5
M0
Input (weak pull-up)
Used with M1 to set operating mode, can be grounded if not used
6
M1
Input (weak pull-up)
Used with M0 to set operating mode, can be grounded if not used
7
RXD
Input
UART receive, connects to TXD pin of external MCU
8
TXD
Output
UART transmit, connects to RXD pin of external MCU
9
AUX
Output
Module operating status indicator, can be used to wake up external MCU, can be left floating if not used
10
VCC
-
Power input, 2.3~5.5V DC
21
ANT
-
Antenna interface, connects to 50Ω impedance antenna
12/14-18
NC
-
No connection pins, no need to connect
3.2 Hardware Design Notes
Power Design: It is recommended to use a DC regulated power supply with as small ripple coefficient as possible, reserve more than 30% power margin, and ensure reliable grounding of the module.
Wiring Specification: High-frequency digital traces, analog traces and power lines should avoid passing under the module. If necessary, lay copper on the contact layer of the module and ground it well.
Electromagnetic Compatibility: The module should be kept away from strong electromagnetic interference sources such as power supplies, transformers and high-frequency wiring, and maintain an appropriate distance from 2.4GHz devices such as USB 3.0.
Antenna Deployment: The antenna should be exposed as much as possible and vertically upward. If installed in a metal case, use an antenna extension cable to lead the antenna out of the case to avoid signal attenuation.
4. Operating Modes and Function Description
4.1 Operating Mode Switching
The module supports 4 operating modes, set by the level combination of M0 and M1 pins:
Mode
M1
M0
Function Description
0 (Normal Transmission Mode)
0
0
UART and wireless channel fully open, transparent transmission mode
1 (WOR Transmit Mode)
0
1
Supports wake-on-air, can send data to wake up devices in WOR receive mode
2 (WOR Receive Mode)
1
0
Wireless transmission off, only receives data, suitable for low-power battery-powered scenarios
3 (Deep Sleep Mode)
1
1
Cannot send/receive data, can enter register configuration mode
Mode switching takes effect 2ms after the AUX pin outputs high level. If the module is processing data, it will automatically switch to the new mode after data processing is completed.
4.2 Core Function Description
4.2.1 Fixed Transmission Mode
In fixed transmission mode, the module identifies the first 3 bytes of serial port received data as target address high byte + target address low byte + target channel, and only sends data to modules with the specified address and channel, realizing point-to-point directed communication.
4.2.2 Broadcast Transmission Mode
When the module address is set to 0xFFFF or 0x0000, as a transmitter, it can broadcast data to all modules under the same channel; as a receiver, it can monitor communication data of all modules under the same channel, suitable for group communication and network monitoring scenarios.
4.2.3 AUX Pin Function
The AUX pin is used to indicate the module operating status:
Low level indicates the module is busy (data transmission in progress, self-check initialization in progress), cannot switch operating mode
High level indicates the module is idle, mode switching and data transmission can be performed
When receiving data, AUX will pull low 2-3ms in advance to wake up the external MCU to prepare for data reception
5. Configuration Method and Register Description
The module needs to enter deep sleep mode (M1=1, M0=1) for parameter configuration, supports 9600bps 8N1 serial communication format. The core command formats are as follows:
Command Type
Send Format
Return Format
Example
Set Register
C0 + start address + length + parameters
C1 + start address + length + parameters
Set channel to 0x09: send C0 05 01 09, return C1 05 01 09
Read Register
C1 + start address + length
C1 + start address + length + parameters
Read channel: send C1 05 01, return C1 05 01 09
Temporary Set Register
C2 + start address + length + parameters
C1 + start address + length + parameters
Parameters are only valid for the current power-on cycle, restore default values after restart
5.1 Core Register Description
Address
Name
Function Description
00H-01H
ADDH/ADDL
Module address, default 0x0000, supports broadcast/monitoring when set to 0xFFFF
02H
REG0
Configure UART baud rate (1200~115200bps), parity bit, air data rate (2.4~62.5kbps)
03H
REG1
Configure sub-packet length (32/64/128/200Byte), RSSI noise detection switch, transmit power (10~22dBm)
04H
REG2
Channel setting, 0-83 corresponds to 410.125~493.125MHz, step 1MHz
05H
REG3
Configure RSSI byte output, transmission mode (transparent/fixed), LBT monitoring, WOR cycle (500~4000ms)
06H-07H
CRYPT_H/CRYPT_L
Communication encryption key, write-only, cannot be read, ensuring data transmission security
5.2 Factory Default Parameters
Parameter Item
Default Value
Operating Frequency
433.125MHz
Module Address
0x0000
Air Data Rate
2.4kbps
Serial Baud Rate
9600bps, 8N1
Transmit Power
22dBm
Transmission Mode
Transparent transmission
6. Typical Application Scenarios
The industrial-grade design of the E220P-400T22S makes it widely applicable to the following scenarios:
6.1 Smart Metering System
In remote water, electricity, gas and heat metering scenarios, the low-power feature of the module supports battery power supply, 7km communication range can cover large-scale residential areas, and encryption function ensures metering data security, greatly reducing manual meter reading costs.
6.2 Industrial Sensor Network
In factory environments, the module can connect to various temperature, humidity, pressure and liquid level sensors to realize wireless collection of production data. The anti-interference design ensures stable communication in complex electromagnetic environments, providing data support for industrial Internet platforms.
6.3 Building Automation
Used for wireless communication in intelligent lighting, elevator monitoring and fire alarm systems, avoiding complex wiring, supporting multi-node networking, and reducing construction difficulty and cost of building intelligent transformation.
6.4 Agricultural IoT
In field planting and livestock breeding scenarios, the module can connect to soil monitoring and environmental sensing equipment to realize remote data collection and equipment control. The low-power feature is suitable for field battery-powered deployment.
6.5 Intelligent Security System
Used for wireless anti-theft alarm, access control and video monitoring data backhaul. The long-distance communication feature is suitable for large-scale security deployment in parks and factories.
7. Frequently Asked Questions and Solutions
7.1 Short Communication Range
Possible Causes:
Obstacles, same-band interference, or metal objects near the antenna
Air data rate set too high (higher rate leads to shorter transmission distance)
Insufficient power supply voltage, resulting in reduced transmit power
Poor antenna matching or low-quality antenna
Solutions:
Elevate the antenna installation height as much as possible, avoid obstacles and interference sources
Reduce the air data rate, adjust the transmit power to the maximum value
Ensure the power supply voltage is ≥5V, use a regulated power supply
Replace a matched high-gain antenna, use an antenna extension cable when deployed inside a metal case
7.2 Module Easy to Damage
Possible Causes:
Power supply voltage exceeds 5.5V or reverse polarity connection
Unreleased static electricity causing chip breakdown
Operating environment humidity too high or temperature out of range
Solutions:
Add over-voltage and reverse polarity protection circuits, strictly control the power supply voltage
Implement electrostatic protection during installation and operation, ensure good module grounding
Avoid using in environments exceeding the -40℃~+85℃ range
7.3 High Bit Error Rate
Possible Causes:
Same-frequency signal interference nearby
Unstable power supply causing communication abnormalities
Antenna extension cable too long or poor quality
Solutions:
Switch the communication channel to avoid interference frequency bands
Optimize power supply design, add filter capacitors
Shorten the antenna feeder length, use low-loss coaxial cable
8. Selection Reference and Peer Comparison
8.1 Peer Product Parameter Comparison
Product Model
Core Chip
Transmit Power
Maximum Communication Range
Receive Current
Package Size
E220P-400T22S
LLCC68
22dBm
7km
11mA
16*26mm
E220-400T30S
LLCC68
30dBm
10km
12mA
18*28mm
Competitor SX1276 Module
SX1276
20dBm
5km
15mA
17*26mm
8.2 Matching Antenna Recommendations
Ebyte officially provides a variety of matching antennas for selection:
Antenna Model
Type
Gain
Application Scenario
TX433-JZ-5
Rubber Antenna
2.0dBi
Short-distance devices, handheld terminals
TX433-JK-20
Rubber Antenna
3.0dBi
Medium-distance transmission, fixed equipment
TX433-XPH-300
Suction Cup Antenna
6.0dBi
Long-distance transmission, outdoor deployment
About Ebyte
Chengdu Ebyte Electronic Technology Co., Ltd. is a national high-tech enterprise focusing on wireless communication applications. Its products cover the full range of wireless modules including LoRa, Bluetooth, Wi-Fi and 5G, which are widely used in industrial IoT, smart home, smart agriculture and other fields. The company has established technical cooperation with multiple universities around the world, and its products have passed international certifications such as FCC, CE and RoHS, and are exported to more than 160 countries and regions. It can provide customers with customized development and one-stop wireless communication solutions.
Official Website: https://www.cdebyte.com
Technical Support: [email protected]
Address: Building B5, Mould Park, 199 Xiqu Avenue, High-tech Zone, Chengdu, Sichuan, China
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