Open or closed?
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You can use Door/Window Sensor 2 as a scene trigger. When placed on the main door, the sensor can launch a Z-Wave Scene which will greet you when you come home.
You will know about every door or window which was left open by accident. The Door/Window Sensor 2 can send an alert about it directly to your smart phone.
Turn lights on.
Places where the simplest way of turning on the lights is by opening the door will be perfect for the Door/Window Sensor 2. After a set time, it can also turn the lights off automatically – very clever indeed