After the water has returned, the alarm be released synchronously. Description: Long standby time, more worry-free: low power consumption, standby for up to 1 year, no need to replace the battery frequently, when the battery is low the APP push notification, please replace the battery in time. Applicable life scenarios: There are always some unexpected accidents in life, stop water and forget to turn off the faucet/children plaving with water bursting of water pipes/leaking fish tanks / leaking kitchen/pets playing with water . When you buy and install this leak-proof device: when the alarm overflow, it reacts quickly, the alarm flashes and the phone receives an APP push reminder to let you know in time and take corresponding measures. Noted: Zigbee water sensor requires a Zigbee Gateway Hub. (Users should choose a smart life gateway before choose such zigbee version), Weight: 0.45745919365 Pounds, Manufacturer: Frewurwer