Solidtek KB-550. Device interface: RF Wireless. Wireless range: 7 m. Keyboard dimensions (WxDxH): 289.05 x 164.08 x 26.92 mm, Keyboard weight: 598.74 g. Battery type: AA, Current consumption: 250 mA. Operating temperature range (T-T): 0 - 55 °C, Storage temperature range (T-T): -20 - 65 °C