SANOXY Wireless Optical Mouse Color: show as picture; Package include: 1 x Cordless Mouse Installation: 1. Please remove the Bluetooth device from the bottom of the mouse and insert it into the computer. 2. ONLY After installation is complete insert two batteries correctly into the mouse. 3. Click the “ON” button on the bottom of the mouse. Note: please follow this step by step to ensure no quality issues with the device. Do not insert batteries until after installation is complete.