IOTDC Dry Contact sensor is a long range wireless sensor which can be used to detect contact between two wired contact points. This sensor can allow to use up to 4 Dry Contact inputs(such as open-close sensors and switches) with it. So the device provides LPWAN connectivity to your Dry contact outputs and make them connected device(s) as a real plug&play. It sends message which give information about every dry contact inputs� status when any of them is changed. This sensor is fully compatible with LoRaWAN technology. The standard version of this sensor is powered by one replaceable 3.6 V AA sized battery (included with purchase).