Don't jeopardize your children's safety when it comes to swimming pools. Be alerted to accidental falls before it's too late with a pool alarm that activates a loud siren the moment a child falls into the pool. This Above-Ground Pool monitors round pools up to 24' in diameter, or oval pools up to 16' x 32'. The poolside unit uses one 9V battery (sold separately). The indoor receiver plugs into an AC outlet, and uses a 9V battery in the event of a power outage. # Above-Ground Pool Eye Alarm PE13 This underwater wave sensor mounts to the edge of your pool and detects disturbances caused by kids or animals as light as 15 pounds, while remaining immune to disturbances caused by wind and rain. Sensitivity is adjustable so you can minimize false alarms or maximize protection. When it detects a fall, it alerts you with a blaring 120dB siren at the pool's edge and a 100dB siren at an indoor receiver placed within 100 feet of the poolside unit. Because the poolside unit is battery operated there's absolutely no shock hazard. It even continues to provide protection during power outages! If the battery runs low, an alarm chirps every 60 seconds, reminding you to replace the battery. The indoor receiver's 3-junction terminal block can also be connected to your existing home security or automation system perfect for monitoring the pool from neighboring kids or pets while you're away from home. All units meet the stringent ANSI/UL 464 and CSA C22.2 requirement. Mounting hardware included.