Alarm Link - This smart heat detector needs to be used with the meross HomeKit hub. When the smart smoke alarm detects smoke/high temperatures, the other alarms are connected under the same hub beep to remind you. One meross hub can hold 16 meross devices (incl. sensors, detectors, and thermostatic valves) at the same time. Smoke and Overheating Detection - In addition to smoke detection, it can also detect overheating. If the temperature is too high (54-70℃), the Meross fire alarm will beep to remind you. It also supports low battery warning. Maximum: 85dB. Real-Time Safety Alarm - When high temperatures or dense smoke are detected, the Meross app or the Apple Home app will be notified immediately. Even if you are not at home, you can receive alarm information in real-time. The home smoke detector has passed multiple safety tests, is easy to use, and provides reassurance. Easy Home Automation - You can set triggers to control other Meross devices in the Meross app. For example, when the smoke detector sounds, the Meros bulb in the hallway lights up. Other methods of use are waiting to be unlocked by you. Apple Home and SmartThings Supported - Compatible with Apple HomeKit (iOS 13 or later), Alexa, Google Home and SmartThings. Control compatible devices through the app Meross and Apple Home (Apple Watch/Apple TV/HomePod). Android users use the app Meross on Android 6.0 or higher.