Expert Wireless Trackball Mouse (K72359WW) Black 3.5 x 6.1 x 8

Large 55mm ball design and Diamond Eye optical tracking for precise cursor control; Patented scroll ring lets you scan up and down pages with easeDetachable ergonomic wrist rest supports hand and wrist for improved comfort; Ambidextrous designCustomizable 4-button design scroll speed and cursor speed via *KensingtonKonnect software. *Windows ARM-based computers are currently not supportedConnects wirelessly via built-in Bluetooth LE or with the USB dongle using 2.4G hz wireless; Auto-sleep helps conserve battery life; Bluetooth connectivity works best for PC Windows 8.1 or later and Mac OS X 10.8 or later; USB dongle connectivity is recommended for Windows 7 or laterPower saving mode puts mouse to sleep when not in use; power settings can be updated in the KensingtonWorks softwareCompatible with Windows macOS ( 10.14 and later) and Chrome (OS 44 and later); 3 year coverage and lifetime technical support