Reliable 2. 4Ghz wireless Strong, consistent wireless connection from distances up to 10-meters (33-feet) away. With virtually no delays or dropouts, you\'ll work and play with confidence. Tested to 10 meters, the wireless range may vary slightly based on your computing conditions and environment. 12-month battery life Work for up to a year between battery changes. To extend the battery life, use the On/Off switch power off when not in use. Your battery life experience may vary slightly based on your computing conditions and how you use the mouse. Plug-and-play connection The M171 Wireless Mouse is truly plug and play. Just insert the receiver into a USB port on your computer and begin using it right away. There is no need to pair the mouse or to download software in order to begin using it Comfortable and mobile The shape of the mouse supports your hand for hours of comfortable use. The ambidextrous shape and the ability to reassign right and left button functions make M171 the ideal mice for the right or left hand.