All functions tested: Buttons, Scroll bar, Roller ball, Microphone, Speaker. Working exactly as it should. Unlike other sellers I have thoroughly tested this and auctioned off the units that didn’t make the grade. This is compatible with both windows and Mac iOS. If you aren’t happy with it I will sort it out with no fuss. The photos are of one of the units- the one you get may show minor signs of use just as in the pictures. Sent with Royal Mail
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