Nothing else needed. It’s got 2 pieces- 1st is a wifi hub. It needs to be located by the garage door opener . ( It comes with a mounting bracket, mount it on the ceiling of the garage right by the opener. I have an outlet in the ceiling that my garage door opener plugs into, i used the open outlet to plug this hub in) The hub connects to wifi, and also gets programmed to be a remote control for the garage door. Be sure you have wifi signal in your garage or this won’t work.
The 2nd part is a small (3”x3”) box that velcros to the inside of your garage door. This is a switch that will send a signal to the hub, letting the hub know if the door is closed or open.
Its a pretty easy setup, the app walks you through it.