Dimensions Overall Height: 139.9 mm Width: 354.3 mm Depth: 23.5 mm Weight: 390 g (with batteries) Touchpad Height: 76 mm Width: 47 mm Technical Specifications Connection Type Logitech Unifying protocol (2.4 GHz) Wireless range: >10 m wireless range 1Wireless range may vary due to environmental and computing conditions. Optional software Logitech Options Battery Battery: 2 x AA (included) Battery: 18 months 2Battery life may vary based on user and computing Special Keys Mute, Volume Down, Volume Up Connect/Power: On/Off Switch Key Life Up to 5 million keystrokes