Acme United WS02. Device interface: USB, Purpose: PC/server, Recommended usage: Office. Movement resolution: 1000 DPI, Movement detection technology: Optical, Scroll type: Wheel. Wireless receiver interface: USB, Receiver type: nano. Keyboard dimensions (WxDxH): 450 x 165 x 17 mm. Power source type: Battery, Battery technology: Alkaline, Mouse battery type: AAA