https://www.thethingsnetwork.org/device-repository/devices/netvox/r718j2/
R718J2 can be connected to external dry contact devices, such as various switches, buttons, relays and reed switch outputs. It can detect the closure or...
dry contactwirelessinputinterfacedevice
https://www.thethingsnetwork.org/device-repository/devices/netvox/r718t2/
The Wireless 2-Input Push Button Interface allows a notification signal to be sent when connected push button is pushed. When someone is in danger and needs...
push buttonwirelessinputinterfacedevice
https://secure.danielraines.com/en/products.php?p=usb-io-interface-card
USB i/o card for connecting inputs to a pc then driving outputs such as relays
input outputusbinterfacecard