Enjoy the sound of silence : With the same click feel and over 90% noise reduction on the click sound, you\'ll enjoy a quiet experience with this Logitech mouse, for yourself and those around you. Sound level comparison with Logitech M170. Measured by an independent lab and verified by Quiet Mark Crafted for your right hand : The ergonomic B330 SILENT PLUS wireless mouse is designed with contoured grips made of soft rubber for total comfort Up to 2 years between battery changes : Thanks to energy-efficient engineering, this computer mouse automatically puts itself to sleep when not in use. Battery life may vary based on your use Reliable connection up to 10 metres away : Thanks to the plug-and-forget nano USB receiver. The B330 SILENT PLUS cordless mouse also features Logitech Advanced Optical Tracking for precise moves on almost any surface, on Windows as well as Mac Ideal for silent environments : Use the B330 Silent Plus with your laptop or Macbook in the university library of airport lounge Enjoy the sound of silence : With the same click feel and over 90% noise reduction on the click sound, you\'ll enjoy a quiet experience with this Logitech mouse, for yourself and those around you. Sound level comparison with Logitech M170. Measured by an independent lab and verified by Quiet Mark Crafted for your right hand : The ergonomic B330 SILENT PLUS wireless mouse is designed with contoured grips made of soft rubber for total comfort Up to 2 years between battery changes : Thanks to energy-efficient engineering, this computer mouse automatically puts itself to sleep when not in use. Battery life may vary based on your use Reliable connection up to 10 metres away : Thanks to the plug-and-forget nano USB receiver. The B330 SILENT PLUS cordless mouse also features Logitech Advanced Optical Tracking for precise moves on almost any surface, on Windows as well as Mac