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 from the brand that has set the industry standard in trackballs for more than 20 years.Features:- Wireless connection via Bluetooth 4.0 LE or USB nano receiver- TrackballWorks software lets you customize all 4 buttons adjust cursor speed- DiamondEye 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 lifeDual Wireless TechnologyThe ultimate in wireless freedom allowing you to connect either via Bluetooth 4.0 LE that allows you to save a valuable USB port or through a highly reliable 2.4GHz USB nano receiverTrackballWorks CustomizationFree downloadable software provides an even more personalized experience giving you the ability to assign a wide variety of program functions to each of the 4 buttons as well as adjusting cursor and scrolling speeds *For Mac users TrackballWorks customization is only available with 2.4GHz USB receiverDiamondEye Optical TrackingMovement detection technology provides smooth precise cursor control so you can get where you want on the screen quickly with less hand movement improving productivity and efficiencyScroll Ring and Large BallSpin the dial to move up and down web pages or documents with complete ease. The red ball has been specially designed with an absolute spherical hard surface for precise tracking and control.Ambidextrous DesignWorks equally well for both right-handed and left-handed users to get the most out of their trackballDetachable Wrist RestSoft cushioning cradles the hand and wrist in ergonomic comfort for pain-free productivity during extended periods of activity on the computer