Amazon offers Kensington Expert Wireless Trackball Mouse (K72359WW) for $59.49，FREE Shipping
Wireless connection via Bluetooth 4.0 LE or USB Nano receiver
Trackball Works software lets you customize all 4 buttons, adjust cursor speed
Diamond Eye 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: Chrome OS 44 and above, Mac OS 10.8, Mac OS 10.9, Mac OS Sierra 10.12, Mac OS X 10.10, Mac OS X 10.11, Windows 10, Windows 7, Windows 8, Windows 8.1.
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