Install mouse/keyboard Open the battery cover at the bottom of mouse, please insert correctly, after battery installed, the LED will light up for 2 seconds then die out, which means the mouse works well. Open the battery cover the bottom of keyboard, please insert battery correctly, after battery installed, then keyboard turns into working position. Receiver Installation: For laptop, you can connect the receiver with the USB connector directly. For desktop, suggest you connect the receiver at the desktop, so you can reduce interference. This type of combo doesnâ€™t need to code, you ca enjoy using them freely.