Feature: Fitted with Sleeping Technology Tthe mouse will shut off automatically and enter sleeping mode for saving power when it's not used for a long time. To wake it up, press the right or left button. Ergonomically-designed 2.4 GHz wireless optical mouse, suitable for home or office use Optical tracking technology, works on many different surfaces 16 wireless working channels, automatic frequency jumping Frequency: 2402MHz-2480MHz Wi-Fi Range: 5-8m app. Rated Operational Current: 8-15mA 1.5V/3V USB Receiver Size: 18 x 14 x 5mm app. Powered by two AAA batteries not included Compatible with most laptop and desktop computers via USB receiver packed in the mouse, such as Windows 2000/XP/Vista/Linux/Win 7/MacOS Cautions: Operation distance is closely related to the environment. Package List: 1 x Wireless Mouse 1 x USB Receiver