The external antenna can receive Wi-Fi signals better and support up to 3 garage doors at the same time. Compatible with over 200 brands and 1600 different models. Supports the latest garage opener models as well as the old garage openers from the 1990s. Comes with a high-sensitivity sensor that more accurately monitors the status of the garage door. Installation is much easier than you might think. With just a few simple steps, you can make your garage door smart.