The WetKeys compact washable computer mouse is a fully sealed and Waterproof silicone USB optical mouse in a space-saving yet comfortable size. It’s ideal for medical, industrial and food service applications where dirt, liquids or germs are always a concern. 2 buttons plus optical scrolling (USB/PS2). Technical Specifications Compatible with Windows 98, ME, 2000, XP, Vista, MAC Button Layout: 3-button with optical scroll wheel Dimensions: 4.125" x 2.375" x 1.375" (LxWxH) Weight: 3.9 oz. Storage temperature: -20 to 70C (-4 to 158F) Operating temperature: 0 to 70C (32 to 158F) Sealed, Waterproof, immersable (do not immerse USB connector) Silicone assembly with 6 ft. cord Resistance: IP65 (protected against water-jet streams) and IP67 All our flexible keyboards and mice have the CE, FCC and RoHS certifications