LEIYANG Ultra Slim Rechargeable 2.4 GHz Optical Wireless Mouse Cordless MiceSwitchable DPI 800/1000/1400, 4 Buttons with Nano USB Receiver Switchable DPI 800/ 1000/ 1400 2.4GHz Wireless mouse, High precision, reponsiveness, High stability Rechargeable Battery: With lithium battery and rechargeable USB cable, you don't worry about changing battery often, which is environment friendly USB Nano Receiver which can be stored within the back of the mouse. Infrared technology ensures smooth track over a variety of surfaces. Tiny USB receiver occupies minimal space when attached to your computer. Supply Power:3.7V Li-Battery (batteries included)