The Expert Mouse Wireless Trackball gives you the freedom to be hyper-productive without being limited by a USB cable | The trackball can be paired through Bluetooth 4.0 LE to save a valuable USB port, or connected via USB nano receiver | TrackballWorks software offers incredible customization, and optical tracking technology offers smooth, precise cursor control. Plus, our award-winning Scroll Ring lets you quickly scan up and down web pages or long documents | Add it all up and you get exceptional comfort and ease-of-use from the brand that has set the industry standard in trackballs for more than 20 years | 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 | Ambidextrous Design | Auto Wake/Sleep | Wireless USB Receiver Storage