Poolguard Wireless Door Alarm

This Wireless Door Alarm will sound immediately (loud 85 dB horn at 10 feet) when the door is opened and will continue to sound if the door is left open. If someone goes through the door and closes it, the door alarm will sound for five minutes and then automatically reset.
Features: 

• Equipped with an adult pass-through feature and when used will allow passage through the door without the door alarm sounding.
• Easy to install
• Always on
• Will automatically reset under all conditions.
• Uses one 9-volt battery (not included) with a battery life of approximately six months; low battery indicator will audibly alert you when your battery is getting low. 
• The only door alarm that is UL-Listed under UL 2017 for water hazard entrance alarm equipment. Complies with barrier codes.
• One-year warranty.