Uping 2.4G Nano Cordless Optical Mouse - 18 Month Battery Life - Battery Level Indicator - 2.4 GHz -3 Adjustable CPI Levels: 1600/1200/800 CPI - Nano USB wireless receiver - Grey Adopt the 2.4G frequency technology, working distance can reach to 10M, 2.4G will give you a more comfortable, convenient and exact effect than the traditional FM radio wireless mouse USB Nano Receiver, stays in your PC, so there's no need to unplug it when you move around. DPI button to select favourite cursor speed, 1600/1200/800 CPI, to suit both ordinary and gaming needs. 18-month battery life on 1 AA battery practically eliminates the need to replace batteries. Battery life may vary based on user and computing conditions With Battery Level Indicator, will let you know when power levels are running low Auto Power Off (APO): the mouse will be switched off automatically when the USB Nano receiver is disconnected with your pc, or the PC is switched off