Logitech Unifying® Nano USB receiver connects up to 6 Unifying-compatible devices - - Logitech Advanced Optical Tracking allows this mouse to be used on surfaces other optical mice can't handle - - On - Off switch and smart sleep mode preserves power and extends battery life (12 months) - - LED indicator light - - Comfort in either hand with hand-friendly, contoured designed soft rubber side grips - - Works with Window, Mac and Linux - - - Logitech Warranty Only - - - Also available in - Black - and - Perfectly Pewter - -