Add remote control: Controller code matching-there is a learning button in the round hole marked with program on the side of the controller. After pressing the learning button for 1 second, the indicator light starts to flash slowly, then release the button, press the stop button of the remote control handle, and the indicator light flashes quickly and then stays on to indicate successful learning. Automatically exit if no operation is performed within 10 seconds. Learn up to 20 different remote control handles. Delete remote control: Controller code clearing-press the learning button and hold it, the indicator light starts to flash slowly, and after 10 seconds, the indicator light flashes quickly and stays on to indicate successful deletion. Stable and : Improved and upgraded with environmentally friendly shell, the shell is made of reinforced PVC, with strong pressure resistance, anti-fall and anti- Intelligent and safe: The device comes with a learning button, you can delete the remote control handle at any time, and you can also increase the number of handles at any time, and you don't have to worry about losing the remote control.Note: This controller is a special controller for roller shutter tubular motors. Colour:Black Material:PVC Package Contents: 1 x Rolling Door Receiver 2 x Controllers Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.