可参看连接: https://www.amazon.com/Kensington-Expert-Wireless-Trackball-K72359WW/dp/B01936N73I/ref=sr_1_sc_1?ie=UTF8&qid=1513001019&sr=8-1-spell&keywords=kingstone+trackboll
2017 年年初购买,现在因使用的较少,转让掉,价格面谈:)
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