Vertical Mouse, Right Handed 2.4GHz Wireless Ergonomic Rechargeable Vertical Mouse with 4 Adjustable DPI 800/1200/1600/2400, 6 Buttons,Compatible with PC, Desktop,Mac (Black)… Black cocoon These are used to mute

These are used to mute one or more piano strings during piano tuning

indicator can help you check the charging status

Superior Comfort and Support: Equipped with thick elastic foam padding

rubber coated handle

Vertical Mouse, Right Handed 2.4GHz Wireless Ergonomic Rechargeable Vertical Mouse with 4 Adjustable DPI 800/1200/1600/2400, 6 Buttons,Compatible with PC, Desktop,Mac (Black)… Black cocoon These are used to muteVertical Mouse, Right Handed 2. 4GHz Wireless Ergonomic Rechargeable Vertical Mouse with 4 Adjustable DPI 800 1200 1600 2400, 6 Buttons,Compatible with PC, Desktop,Mac (Black) Description System requirements IBM or compatible computer Windows2000 ME XPx64 Vista 7 8 Mac OS Xover V10. 4 An available USB port Package Contents Mouse x1 Receiver x1 Instructions x1 Specification Button number6 buttons Tracking System: optical Frequency: 2405MHz 2476MHz