Pool Alarm

Wondering if a pool alarm is in development? Drowning is the leading cause of death in children less than 4. It wouldn't replace direct supervision, barriers, or training, but accidents happen. This would be a way to set off alarm, so if an accidental fall into the pool, while parents are away, would be notified. I have grandchildren, and have door & window alarms, and a camera on my pool to assist in alerting me with movement, but it constantly goes off and it goes off every time anyone walks past, the pool alarm would only detect water movement. We all live on our phones, and this would be a great benefit and enhancement to the system.