The Poolguard DAPT–WT Door Alarm is equipped with an adult pass–through feature that allows adults to go through the door without the alarm sounding. The Poolguard Door Alarm will sound immediately when a child opens the door, and the alarm will continue to sound until an adult comes to the door. If a child goes through the doorway and closes the door, the alarm will sound for 5 minutes and then automatically reset. The Poolguard DAPT–WT Door Alarm is always on and uses one 9–volt battery and features an audible low battery indicator.