Accuratus KYB-TOUGHBALL. Device interface: RF Wireless, Recommended usage: Office, Keyboard form factor: Standard. Movement resolution: 800 DPI, Movement detection technology: Optical, Scroll type: Ball. Frequency band: 2.4 GHz, Wireless range: 15 m. Wireless receiver interface: USB. Keyboard dimensions (WxDxH): 182 x 387 x 49 mm