kensington MC K72359WW Nano USB Expert Mouse× Wireless Trackball Retail

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