Add a second garage door opener to your MyQ Garage (MYQ-G0201) to monitor, open and close two garage door openers with your Smartphone. The MyQ Garage Door Sensor is mounted to the inside top panel of the garage door opener and is added to your account through the Chamberlain MyQ app. The Door Sensor works with most major brands of garage door openers made after 1993. Installs in minutes.