ULTRA-QUIET MOUSE - 90% reduced click sound and same click feel eliminates noise and distractions for you and others around youQUIET MARK CERTIFICATION - Logitech is the first mouse company in the world to receive the Quiet Mark certification from the UK Noise Abatement Society that internationally recognizes technology designed to reduce noiseERGONOMIC SHAPE - Designed with contoured grips made of soft rubber for total comfortLONG BATTERY LIFE - 2 year battery life and auto-sleep help you go longer between battery changesPLUG'N'PLAY CONNECTION - Nano-sized Logitech wireless unifying receiver stays in your computer - plug it in, forget it, even add compatible wireless devices without multiple USB receivers. Note: No Bluetooth connection, only USB connectionBrandLogitechColourBlackConnectivity technologyWi-FiSpecial featuresWirelessMovement detection technologyOptical