I did this myself because when I was out of town, my daughter could not get the keypad to work one evening and we almost had a small crisis. This pushed me over the edge to "make the move" to have a smart garage. I felt this was simple, and that there had to be an alternative to the very expensive options I saw.This device is one of a growing family of "Internet of Things" (IOT) devices, made by one of many talented "no name" Chinese technology companies. It is really an amazing thing that you can get an internet-integrable system like this for less than $50. It is really two separate devices, one being an actuator (switch) that activates the garage door, and one being a sensor that monitors if the door is open or closed (when properly mounted). Together, these two things work together to create a "smart garage door". The smart garage will co-exist with whatever devices you already have, as far as I can tell. It will not require you to throw away your current remotes, wall switches, and outside key pads. What the smart garage will do for you in this case is: (1) give you a way to remotely open your door from anywhere in the world and (2) tell you if the garage door is opened or closed.The IOT concept is implemented through a Wifi connection. The smart garage requires electrical power to run a small box (see picture, device with a blue light is mounted to ceiling), and this box will provide an internet connection. The Smart Life application is available for Android and IoS (there is a Reddit for Smart Life devices -- https://www.reddit.com/r/smartlife/ -- many more than just this smart garage). Using it, you can switch your garage door and monitor if it is closed or open. Pushing the switch does exactly what your remote does when you press the button. THis is because all that the "smart garage" is is merely an internet controlled switch. It relies on the sensor to actually verify that your activation caused the garage to close or open..Can you use the "smart garage" only and throw out the remotes and keypads, etc. Usually, you would keep all of them, but in theory you could remove them and use only this device through your smartphone (others have commented that it is awkward to actually use this instead of your existing remote, so consider it a good backup).I did find installation to be a very frustrating experience. THe instructions are some of the worst I have ever found for anything. The design of the concept deserves far better documentation than the miserable attempt that was offered to the buyer. The English is fragmented, wrong, and the illustrations were non-readable to average people. I almost concluded the device was defective until i found another reviewers comment about holding the button down (this is the small black button on the primary module) for about ten seconds. Only after doing this did my Chamberlain Whisperquiet unit respond to button pushes. These pushes replicated the behavior of a wall switch or remote, causing the door to move up or down with each press. So, I would summarize the installation as:1. Find a place to mount the primary unit, preferably close your garage door opener.2. Make sure you mount the two wires in parallel with the wires used by your wall switch. In the first picture, you can see that I did this by intercepting the wires where they emerged from the ceiling (going to two terminals in the garage door opener itself).3. You of course must have internet access, a Wifi hotspot, and you must install an application for this on your phone. You will need to make sure you have an account, etc. In my case, I had previously installed a Smart Life wall switch, so i had an account and the application was already installed and it knew of my hot spot and had the login credentials to my local wifi network. With this all in place, you plug in the unit to 110VAC power, holding in the push button until you get a rapid blue flash. You then go into the application. I did not find the procedure matching the instructions and somehow fumbled through this using an "add new device" and guessing a type of WIfi switch. Somehow, eventually, the device was discovered and added as a garage door. You can push a switch icon at the bottom left of a display screen and if lucky your garage will respond.4. If you got this far and you didn't already install the sensor, as I describe next, the install will still work. It will, however, not understand whether the door is open or not. The sensor is in two pieces. The first a small rectangular object at the end of a long cable. The second is a similar sized object with no wires attached. The principle of operation is simple. When the two pieces are in close proximity, the application believes the garage door is closed. Otherwise, open. You will have to devise a suitable mounting arrangement (see my example, second picture) so that when you garage is closed, the pieces are aligned, but when opened the pieces separate. Ensure you have adequate clearances of the cable and do not position the pieces so close that they have a friction or interference fit. You have a few millimeters gap to work with.5. IF all went well, you now have a smart garage that co-exists with everything you had before the smart garage was added.My rating was harsh. THis is because for all the goodness, I really had a lot of difficulty with the ineptly prepared instructions. Could the group who so expertly designed the hardware and software of this system not break down and spend just a little bit to have good instructions written?