Kensington Expert Mouse® Wireless Trackball DiamondEye - Wireless - Bluetooth/Radio Frequency - Black - USB - Scroll Ring - 4 Button(s) - Symmetrical - 1 Each (72359)

Wireless connection via Bluetooth 4.0 LE or USB nano receiver

TrackballWorks software lets you customize all 4 buttons, adjust cursor speed

DiamondEye optical tracking technology for premium cursor control and accuracy

Award-winning Scroll Ring lets you scan up and down pages with ease

Large ball is designed as a perfect sphere to provide exceptional precision