Features ergonomic design, advanced optical sensor technology, DPI switch button to select three distinct levels of DPI resolution (1000/ 1500/ 2000), battery-saving on/off power switch, two Internet navigational buttons, and Bluetooth connection up to 30 feet. Scroll Wheel. Bluetooth® wireless technology. Bluetooth® 3.0 technology works up to 30 feet. Uses 2 "AAA" battery (included). 1-year warranty. Small. Black.