Kensington Expert Mouse Wireless Trackball (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. Detachable wrist rest supports hand and wrist for ergonomic comfort. Ambidextrous design works equally well for both right-handed and left-handed users. Auto-sleep helps conserve AA battery life. Compatibility with USB receiver: Windows 10, 8.1, 8, 7 and Mac OS X 10.8 and later. Compatibility with Bluetooth 4.0 LE: Windows 10, 8.1 and Mac OS X 10.8 and later. TrackballWorks compatible with Mac only when using 2.4GHz connection.