Smart Phone Remote Access Control System with easy installation and set-up Compatible with most residential garage door openers (See our Opener Compatibility list) Some doors require adapter 38013R sold separately Ability to monitor the door position (open or closed)and any change to the position whether it's done through the Aladdin Connect app or manually Ability to know if an authorized user is operating the door with the Aladdin Connect app Maintains access history report for each opener UL 325 compliant - audible and visual signals before door moves when operated from smart device One Door Control Module controls up to three doors while one Door Position Sensor is needed per door (one module and sensor come standard with kit; additional sensors sold separately see part number 39279R)