Kensington Expert Trackball Mouse - Wireless

Large 55mm ball design and Diamond Eye optical tracking for precise cursor control; Patented scroll ring lets you scan up and down pages with ease Detachable, ergonomic wrist rest supports hand and wrist for improved comfort; Ambidextrous design Customizable 4-button design, scroll speed and cursor speed via *KensingtonWorks software; customizing with TrackballWorks software on Mac OS is only available when connected with the USB dongle. *Windows ARM-based computers are currently not supported. Please check back for future updates on compatibility Connects wirelessly via built-in Bluetooth LE or with the USB dongle using 2.4Ghz 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 later Power saving mode puts mouse to sleep when not in use; power settings can be updated in the KensingtonWorks software Compatible with Windows, macOS (10.14 and later), and Chrome (OS 44 and later); 3 year coverage and lifetime technical support