Acteck AT-SLX700RF. Device interface: RF Wireless, Keyboard layout: QWERTY. Movement resolution: 800 DPI, Movement detection technology: Optical. Keyboard dimensions (WxDxH): 423 x 184.9 x 22.2 mm. Operating temperature range (T-T): 5 - 40 °C, Operating relative humidity range: 20 - 90 %