MOJO Silent Bluetooth Vertical Mouse - Wireless Optical Ergonomic Mouse w/Adjustable Sensitivity Bluetooth wireless connection - No USB dongle required! Compatible with Windows, Mac, Android, Linux. (Please note iPads, iPhones, and most other tablets and smartphones are not compatible with computer mice.) Number of Buttons: 6 (plus scroll wheel), all silent, Powered by 2xAAA batteries (included) Adjustable DPI/sensitivity button (800-1200-1600dpi), Bluetooth pairing button, Low battery indicator, Next/Last Page (for web browsing) Ergonomically designed to reduce stress and discomfort associated with overuse in your hands, wrist, elbows, forearms, and shoulders by maintaining a neutral "handshake" grip. Bluetooth wireless connection - No USB dongle required! Compatible with Windows, Mac, Android, Linux. (Please note iPads, iPhones, and most other tablets and phones are not compatible with computer mice.) Number of Buttons: 6 (plus scroll wheel), all silent, Powered by 2xAAA batteries (included) Adjustable DPI/sensitivity button (800-1200-1600 dpi), Bluetooth pairing button, Low battery indicator, Next/Last Page (for web browsing)