1. It'll alarm when the water level reach the desired level 2. Wireless alarm Detect water overflow output wireless radio signal and activates alarm.Alarm On/Off switch.9V battery operation (not included).Low power consumption - - - long battery life.Battery low indicator LED.Wireless RF transmission up to 40 meters.

Receiver:

Melody/Off/Alert switch.Sound High/Low switch.3 "C" size batteries operation (not included ) with DC jack.Compatible multi-sensor.

Wireless Water Level (Bathroom Tub) Alarm Device