2.4GHz Wireless and USB Receiver: . Built-in Micro Nano receirver can put inside the mouse, which is very easy and convenient to carry on. Ultra-thin: Lightweight, compact design Type: Wireless mouse Wi-Fi Range: 10m Interface Type: USB Number of Buttons: 4 Tracking Method: Optical Rated working voltage: 3 V Rated working current:10mA DPI: 1000/1200/1600 DPI Battery model: 2 * AAA batteries (not Included)