Onvis Door/Window Contact Sensor
So you would like to monitor for unexpected activity around your windows or doors? This Onvis Door/Window Contact Sensor has you covered. It sends you automatic notification and lets you know when your door is open. The CT2 Bluetooth 5.0 contact sensor is compatible with HomeKit.
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This sensor keeps track of events over 30 days. It plays well with Apple Watch too. Its battery lasts for over a year.
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