Wireless Mouse Genius Ergo 8250S Vertical, 800-1600 dpi, 6 buttons, Silent, 1xAA, 97g., Silver/Grey. Features- Natural ergonomic posture withthumb rest- Stable wireless 2.4G connection,up to 10 meters- 6 buttons: left, right, middle with scrollwheel, forward, backward and dpi- DPI switch: 800 / 1200 (default) / 1600- Silent click, less noise- Receiver slot- USB plug and playSystem requirement- Windows® 8, 10, 11 or later- Mac OS X 10.8 or later- Available USB portPackage contents- Ergo 8250S (Wireless verticalergonomic silent mouse)- USB pico receiver- AA x 1 alkaline battery- Multi-language quick guide