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Meross HomeKit Hub is needed for installation.. Works with Apple HomeKit, Amazon Alexa, and is compatible with SmartThings.. Voice Access: Know the status of the device via HomePod / Siri.. Alert: Your Meross app or Apple Home app will receive an alert instantly when the alert condition is detected.. Low Power Consumption: Up to 18 months lifespan with the built-in battery.. Automation: Set triggers to control other Meross devices in the Meross app.. Control Up to 16?Devices: One hub can control 16 Meross devices (sensors, detectors, thermostat valves) simultaneously.. Due to the inventory allocation, the expected delivery time for this product is 7-14 days.