Sold as 1 Each. Medical mouse is washable. Connectivity: Wired, cable length: 6'. Tracking method: Optical, optical technology: LED. Switch lifecycle: >10000000 cycles. Dimensions: 1.43'H x 2.35'W x 4.6'D. Resolutions: 1000 dpi. Antimicrobial product protection. OS compatibility: Windows, Mac, temperature: -15 to 60 deg C. Red ABS plastic construction. Operating voltage: 5 VDC. Compatible with hospital disinfectants. Meets FCC, CE, RoHS, WEEE, ICES-003, IP 68, NEMA 4x standards. Interface: Gold-plated USB. Buttons and controls: 2 buttons with scroll wheel (clickable). 100% waterproof and dishwasher safe. Weight: 0.24 lbs.