The small and re-usable device is attached to the upper arm of the child or to the belt of the life jacket your child is wearing. When your child tumbles into the water, a floating beacon will be released from the housing unit. Instantly an alarm in the beacon will be triggered which will produce a loud sound signal. The alarm will stay close to your child by a thin wire that connect both parts.
You and everybody else in the neighbourhood of your child will be immediately alerted and triggered to rescue your child from the water.
For the replacable S'iren Water Alarm tablets: http://www.secumar.com