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, & optical tracking technology offers smooth, precise cursor control. Plus, Scroll Ring lets you quickly scan up & down web pages or long documents. Add it all up & you get exceptional comfort & ease-of-use from the brand that has set the industry standard in trackballs for more than 20 years. Connector / Port / Interface: Bluetooth 4.0; USB 2.0; Left / Right Hand Use: Left / Right; Mouse Technology: Optical; Wired / Wireless: Wireless.