The Turtle Pool Alarm Electronic wristband locks comfortable around your child's wrist and is always turned on. There is no wave detector that needs to be adjusted to eliminate false alarms like on other alarm systems. Instead, any time the wristband hits the water; a loud alarm is emitted by the base unit located inside your home or out by the pool. The alarm system is fail-safe and eliminates those annoying and dangerous false alarms. Requires the Turtle Pool Alarm Base Unit for operation.