I first checked that my existing ROLLER door electric motor was compatible with the MEROSS wifi controller by checking their website. All good so ordered item and it arrived very quickly to Melbourne Australia. Item came well packaged. The installation instructions were clear and easy to follow via the MEROSS app on my android phone. The MEROSS controller had two wires that had to be connected to my electric motor's circuit board. I wasn't sure of the exact location so I consulted my motor's own instruction manual (downloaded from internet). Once comfortable I connected the wires. Last thing to connect was the MEROSS unit's sensors (these inform the unit if the door is open or closed). I attached one sensor to the roller door and other sensor (with the wire) to the non-moving frame of the roller door. A quick test via the app showed it all worked. Finally, I attached the MEROSS unit to the side of my motor, made the wires neat and tidy and I was done. Install took about 1 hour. Been using the wifi controller for a month now with no problems. Love being able to use my phone to open and close the door from anywhere anytime. And the notifications are very handy to tell me if my door has been left open. Works well with Google Assistant too. Highly recommend this product.