KeySonic KSK-3001 IBT (DE). Device interface: Bluetooth, Purpose: iPad, Recommended usage: Office. Frequency band: 2.4 GHz, Wireless range: 10 m. Keyboard dimensions (WxDxH): 267 x 128 x 21 mm, Keyboard weight: 254 g. Power source type: Battery. Operating temperature range (T-T): 0 - 40 °C, Storage temperature range (T-T): -30 - 65 °C, Operating relative humidity range: 0 - 95 %