Wireless connection via Bluetooth® LE or USB nano receiver DiamondEye™ optical tracking technology 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 ambidextrous design 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. 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