TeckNet Classic 2.4G Programmable Wireless Mouse with USB Nano Receiver,6 Buttons,18 Months Battery Life, 4800 DPI, 6 Adjustment Levels 6 Programmable Buttons:You can set them for different functions by your own unique preferences,such as key settings, edit settings, multimedia settings, windows settings and so on. TeckNet TruWave technology: Provides precise, smart cursor control over many surface types. TeckNet CoLink technology: After pairing theres no need to re-establish pairing after a signal loss or shutdown. TeckNet 2.4G Wireless Gaming Technology: Experience zero delay between your thoughts and actions with gaming-grade 2.4GHz wireless, an increased working distance of up to 50ft/15m Tiny USB Nano style receiver plugs into your PC and can stay there. Select your preferred cursor speed: 800/1200(Default)/1600/2400/3200/4800, 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 18 months battery life from just one AA battery. Features a battery level indicator.