ULTRA-QUIET MOUSE: This mouse eliminates noise and distractions for both you and those around you by 90% while maintaining the same click feel. QUIET MARK CERTIFICATION: The UK Noise Abatement Society has certified Logitech as the world's first mouse company to earn the Quiet Mark certification, which globally acknowledges noise-reducing technology. ERGONOMIC SHAPE: Featuring soft rubber contoured grips for optimal comfort LONG BATTERY LIFE: You can go longer between battery changes thanks to auto-sleep and a two-year battery life. Plug-and-play connectivity allows you to add compatible wireless devices without the need for multiple USB receivers. The nano-sized Logitech wireless unifying receiver remains in your computer. Note: There is only a USB connection, not Bluetooth.