ECHTPower Gaming Mouse (Wireless 2500DPI) High speed wireless transmission- 2.4GHz Wireless working distance is 30m so that it provides a reliable connection, which is handy to move and gives you a fresh moving speed Tiny USB Nano style receiver plugs into your PC and can stay there. DPI button to select your preferred cursor speed; /2500/2000/1500/1000dpi Energy Efficient: The auto power-off function switches off the mouse when the USB Nano receiver is disconnected Plug-and-play wireless: Get a reliable connection from a convenient nano receiver that stays in your computer For Windows, Mac and Linux: Reliable wireless connection with tiny Unifying Nano-receiver that can stay in your laptop