Ultra slim and lightweight. Battery life: Up to 6 months Snaps flat and slips easily into a pocket or bag Innovative full scroll plane lets you scroll both vertically . Wireless range: 32.8 feet (10 meters) in open area, and 16.4 feet (5 meters) in office environment Dimensions: 5.17 x 2.17 x 0.56 inches. Weight: 2.91 ounces (including batteries). Battery: 2 AAA alkaline batteries (included) Compatibility: Microsoft Windows 10 / 8.1 / 8. Must be Bluetooth 4.0 enabled. Wireless frequency 2.4 GHz frequency range