In order to reset a unit to factory default you will require a paper clip (or something similar) in order to push the reset button.
To factory reset your follow these steps.
Please note: When resting to factory default it is important to reset all transmitter and receiver units. The units have to be reset individually so the procedure must be repeated for each unit.
1.Turn the unit off
2. Using a paper clip of similar push and keep pressed the reset button
3. While the button is pressed apply power to the unit
4. Both the green power LED and blue connection status LED should come on at the same time. If only the Power LED comes on the button is not being pressed and the reset is not taking place.
5. Release the reset button
6. Wait for the unit to power up, indicated by the Blue connection status LED starting to flash
7. Power off the unit