Kensington Expert Wireless Trackball Mouse (K72359WW)
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 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.

Kensington Orbit Wireless Trackball Mouse with Touch Scroll Ring (K72352US),Black
Offering a precise, compact and versatile experience, the orbit wireless mobile trackball has everything mobile professionals need for comfort and productivity. It offers better ergonomics, with less wrist and hand movement that will ease The pain of repetitive-stress injuries. With no cables to tie you down, The 2. 4 GHz wireless Nano receiver works with either Windows or Mac when you're at home, on the road or in the office. Unique touch scrolling, along with the compact 32mm ball, lets you glide effortlessly through web pages and documents, and the Nano receiver can be stored right inside the trackball.