CZNL-08 smart pool alarm,under water circumstanceanalyse technology, this model is surely the top pool alarm in the world. Main properties: Detect children falls at or more than 4 kgs. Alarm reaction within 6 seconds Alarm sound level 110 DBS four 9V alkaline lasts one year. Safety software analysis system, Standard size: 8x4 meters, Maximum size: 8x12 meters. No false alarm for strong wind, No false alarm for pool cleaner hits, No false alarm for strong pool filtration