Meross Smart Smoke Alarm Kit with Hub Control Up to 16 Devices – One hub is able to control 16 Meross standalone devices (sensors, smoke detectors, thermostat valves) at same time. Safe and Reliable: Comply with CE EN14604 (Certified by Intertek), alarm at maximum 85dB. Alarm Linkage: When one alarm detects smoke, all alarms will chirp to remind you. (Purchase multiple smoke alarms.) Alert: Your Meross app or Apple Home app will receive an alert instantly when danger happens. Battery Replaceable: 2 x 1.5V AA batteries included and replaceable. Automation: Set triggers to control other Meross devices in the Meross app. Smoke and Overheat Detection: In addition to smoke detection, it can also detect overheat. When the temperature is too high (54 – 70℃), it will chirp to remind you. Works with Apple HomeKit and is compatible with SmartThings.