B-Move BH-TW01. Device interface: RF Wireless, Purpose: PC/server, Recommended usage: Home. Movement resolution: 1000 DPI, Movement detection technology: Optical, Scroll type: Wheel. Frequency band: 2.4 GHz, Wireless range: 10 m. Wireless receiver interface: USB. Keyboard dimensions (WxDxH): 490 x 180 x 20.1 mm