Nothing special but works great. Bought due to dry contact. I have mine connected to a Z-Wave repeater reporting to a Smartthings hub. I run the Supco and MIMOLite Z-Wave relays in their native 12V DC (battery) mode, so I still get alarms during power outages. The device comes with a 12V DC power outlet. The sensor can be extended up to 200 feet using 24 AWG wire (speaker). I suppose I could do something for less money, but I like to use standard footage.
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