Allows customers to receive an alert by email or push notification if they left their garage open, or if the door has been opened or closed. Turns on lights remotely. MyQ free ap requiring no annual activation fee. Controls up to two doors (extra sensor sold separately) at a time and up to 16 MyQ devices. Works with most major garage door opener brands with Photo Eyes: LiftMaster, Chamberlain, Sears Craftsman. Requires 2.4 GHz Wi-Fi signal