This is mini 433mhz +WIFI white wireless water sensor, it's waterproof, the water proof level is IP66. The wireless water sensor is powered by batteries (23A 12V), the sensor included the batteries.The water sensor size is 4.5 4.5cm. This water sensor support WIFI, it can connect to the phone app and it also can connect to 433mhz Wireless black brass valve. This wireless 433mhz +WIFI water sensor can be intelligent linkage with wireless black valve. Once the water sensor detects the water leakage, this water sensor send out the 433 signal to the wireless black brass valve to close the valve, and at the same time, your phone app receive the leakage notification.