Poolguard GAPT-2 Outdoor Pool Gate Alarm The battery-powered Poolguard GAPT-2 Outdoor Pool Gate Alarm ($50, origianlly $63) isn't actually for the inside of the pool, but for the pool gate. In addition to a pool alarm, this one is perfect to use on an outdoor pool gate so that you can hear an alarm sound before your child even gets to the pool. Poolguard GAPT-2 Outdoor Pool Gate Alarm $50 from amazon.com Buy Now