Uping Nano wireless Mouse | 2.4 GHz Portable Cordless Optical Mice | CPI 1600/1200/800 | 3 Buttons | 18 Month Battery Life | Black+Red UNIQUE DESIGN - Symmetrical design. Suitable for both hands. Taking the streamlined ergonomic technology and the Side to prevent sweat design. Keeping your hand comfortable even after long hours. Besides, the built-in Nano receiver and Avago chip. Is receiving more sensitive MUTE BUTTON - Mute button can give you a comfortable space. So that you can enjoy a silent environment when reading online and browsing the website LONG LIFE+ GREEN - Up to 18 months of battery life and auto 8 minutes sleep mode virtually eliminates the need to change batteries. More energy-efficient. More environmental protection LONG DISTANCE - Increased working distance of up to 15m. 2.4GHz Wireless, Plug-and-play wireless connectivity CPI SWITCH: Switch - 3 adjustable CPI, 1600/1200/800.Control your own speed freely. No need any driver, plug and play directly