The Terrapin Wireless Gate Alarm warns the instant a child opens the gate to a pool fence without adult assistance as well as if the pool fence gate fails to latch closed within 11 seconds of an adult entry. A base station located as far as 200 feet away from a pool alarms to warn the parent to come immediately to the pool area. The Terrapin Wireless Gate Alarm comes with an adult bypass switch which attaches near the gate latch so that an adult can enter without setting off the alarm. $100,