1. Make sure the device is turned on.
2. Make sure the receiver is plugged into the PC’s USB port.
3. The PC can not recognize the receiver, please re-plug the receiver.
4. Check if the battery is installed correctly.
5. Low battery, please change the battery.
6. Move other working wireless devices away from the receiver and device.
7. Please keep away from walls or big objects, because this may reduce the range.