Microsoft Wireless Bluetooth Keyboard Black Specifications Battery Type 2 AAA alkaline batteries Connectivity Device must support Bluetooth® 4.0 or higher Dimensions 434.9 × 123.7 × 19 mm Interface Bluetooth Low Energy compatible 4.x/5.0 Mouse Bundle Operating System Microsoft Windows 10/8.1 Series Supported OS Microsoft Windows 10/8.1 Warranty 1 year Weight 461.6 g