1. Set key: press and hold the "Set key", and release the "Set key" to enter the upper limit learning state after the "running light" changes from flashing to straight light.
2. Add key: Press and hold the "Add key", and the door will run down to the ideal position. Release the key and save the code.
3. Exit and save: Press and hold the "Set Key" and the door will run upward to the ideal position. Release the key, and the learning of saving code is over.