Add-On Door sensor for MyQ Garage (MyQ-G0201) enables you to monitor, open and close both garage doors 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 ; Monitor and control a second garage door with MyQ Garage ; MyQ Garage Wi-Fi hub is limited to 2-garage door openers ; Installs in minutes ; Includes: door sensor, adhesive and screws for mounting ; 1 Year Warranty