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(R) 4. 0 LE to save a valuable USB port, or connected via USB nano receiver. Trackball Works(TM) 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(R) 4. 0 LE or USB nano receiver Trackball Works(TM) software lets you customize all 4 buttons, adjust cursor speed Diamond Eye(TM) 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(R) 10, 8. 1, 8, 7 and Mac OS X 10. 8 and later Compatibility with Bluetooth 4. 0 LE: Windows(R) 10, 8. 1 and Mac OS X 10. 8 and later Trackball Works compatible with Mac only when using 2. 4GHz connection UPC: 085896723592 Colour Group: Black Compatibility: Chrome OS 44 and above, Mac OS 10. 8, Mac OS 10. 9, Mac OS X 10. 10, Mac OS X 10. 11, Windows 10, Windows 7, Windows 8, Windows 8. 1 Connectivity: Wireless Controls: Customizable Buttons, Scrollring Features: Ambidextrous Design, Auto Wake/Sleep, Wireless USB Receiver Storage Sensor: Optical USB Receiver Size: Nano Wireless Type: 2. 4Ghz, Bluetooth 4. 0 LE