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The Pert Door Sensor is a battery based Sensor that works on RF Technology.
- Receive alerts on your smartphone if your Door Sensor detects opening or closing of a door.
- Automate connected devices with Pert Products and set them to turn on or off if your Door Sensor detects opening or closing of a door.
- Requires Pert Multi Sensor.
http://www.pert.me/products/pert-door-sensor/