Here is a smart door/window sensor that lets you know when something unexpected happens in your home. The Onvis Thread-Enabled Door/Window Contact Sensor comes with Bluetooth connectivity. It combines with HomePod mini or Apple TV for home automation.
More gadgets like this: here
The Onvis Door Sensor sends you a notification when there is a state change. It uses a CR2450 cell battery and lasts up to a year on standby.
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