M220 SILENT 18-month battery life (1AA battery) Auto-sleep mode On/Off switch 10m wireless range Advanced Optical Tracking Nano-receiver With the same click feel and 90% noise reduction compared to classic mice, M220 SILENT offers a quiet experience for yourself and those around you. It has a long-lasting 18-month battery life with auto-sleep and a powerful 10-metre wireless range with 128-bit encryption between the mouse and the receiver. Plus, its small size is perfect to toss in a bag and go. Just plug the tiny USB receiver and it works with Windows®, Mac, Chrome OS™ or Linux®. Finally, the Logitech® Advanced Optical Tracking is designed for smooth and precise moves on almost any surface. In the box: Wireless mouse Nano receiver 1 AA battery (pre-installed) User documentation 2-year manufacturer's guarantee and full product support