https://www.thethingsnetwork.org/device-repository/devices/netvox/r831b/
R831B - Wireless Multifunctional Control Box | Device Repository for LoRaWAN
R831B is a device used to control the switch and is mainly used for the switch control of the light electric motor control box.
multifunctional control box
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https://www.thethingsnetwork.org/device-repository/devices/netvox/r831d/
R831D - Wireless Multifunctional Control Box | Device Repository for LoRaWAN
R831D have three relay switches(output) and three dry contacts(input). R831D can report status of 3 dry contacts individually and control 3 relays
multifunctional control box