Experience the convenience of Bluetooth 4.0 technology with our mouse, featuring a built-in 450mAH lithium battery that can be easily charged using the included USB charging cable, similar to a mobile phone. With over 500 charge and discharge cycles, you'll never need to buy batteries again. Compact and lightweight at 113mm x 58mm x 23mm and 3.1 oz, it's perfect for on-the-go use.