Connection interface : Bluetooth® Low Energy compatible 4.0/4.1/4.2/5.0 Wireless frequency : 2.4 GHz frequency range Wireless range : 33 feet (10 metres) in open areas; up to 16 feet (5 metres) in typical office environments Compatibility4 : Microsoft Windows 10/8.1 Device must support Bluetooth® 4.0 or higher Requires Mouse and Keyboard Centre software installation. PC must meet these requirements to download: Microsoft Windows 10/8.1, 150 MB available hard disk space Dimensions : 5.17 × 2.17 × 0.56 in (131.31 × 55.11 × 14.22 mm) Weight : 2.91 oz (including batteries) Battery : 2 AAA alkaline batteries (included) Battery life : Up to 6 months1