If swinging or patio doors near your pool are a problem, the PoolGuard Door Alarm with Wireless Feature is a device that can add peace of mind to your home. Whenever a child opens the door, it sounds an alarm that will continue to ring if the door is left open. Once the door is closed, the alarm will sound for 5 minutes and reset. The alarm will not sound if adults move through the ddor. The alarm remains active at all times and functions using a 9 volt battery sold separately. This alarm comes complete with wireless transmitter, sensors, a sensor magnet, hookup wire, and all hardware needed for installation.