TeckNet Delteck 2.4G Nano Wireless Gaming Mouse, 500Hz Return Rate, 9 Buttons, 24 Month Battery Life, 2400 DPI 3 Adjustment Levels 2.4GHz Wireless Gaming Mouse - A more secure and precise experience than the traditional FM radio system with an increased working distance of up to 10m Tru-Wave technology provides precise, smart cursor control over many surface types. Co-Link technology  after pairing theres no need to re-establish pairing after a signal loss or shutdown Achieve 500Hz of return rate on the speed of transmission between the computer and the mouse for instant response. Tiny USB Nano style receiver plugs into your PC and can stay there. Select your preferred cursor speed; 800/1200/1600/2000/2400DPI, Plug & play - no need to install a driver. Energy Efficient: The auto power-off function switches off the mouse when the USB Nano receiver is disconnected, or the PC is switched off to give 24 months battery life from just 2 AA battery. Features a battery level indicator.