Kensington Expert Mouse® Wireless Trackball SKU: K72359WW Detachable Wrist Rest Soft cushioning cradles the hand and wrist in ergonomic comfort for pain-free productivity during extended periods of activity on the computer. 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. KensingtonWorks™ software offers incredible customization, and optical tracking technology offers smooth, precise cursor control. Plus, our patented 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 30 years.