The SUMRING SR-851Z ZIGBEE Smoke Detector is wonderful Safety & Security Guard for your home security.This Smoke detector designed Zigbee networking technology to ensure product stability.Once fire happen, the zigbee smoke detector send notification to the Tuya smart app of smart mobile phone through zigbee gateway.The matching lithium battery can make the smoke detector work for 10 years , and will warning when low power, with Self-test function. which make you know under the interrupted 7/24 protection, keep your home safe.You will be alerted immediately in the event of a fire, to help you escape from Fire Hazard in time.