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. After the water has returned, the alarm be released synchronously. Description: Noted: Zigbee water sensor requires a Zigbee Gateway Hub. (Users should choose a smart life gateway before choose such zigbee version)