This is a great IoT hardware build for industrial and home automation purposes. It has 4 Relay outputs and 4 inputs. All inputs and outputs are isolated by optocouplers and you'll need external 12V (besides 5V supply for the MCU) for powering the relay. As it says in the description, this is done mainly for industrial purposes and reliability, that is the reason for separate power supplies for the MCU and the relays.

This product is designed by our team and at this moment it is in use by controlling and monitoring remote water pump.

What you get: You will receive the board with all components soldered, plastic enclosure WITHOUT LoRa module. You can order a LoRa module Here

Thank you! Greetings from Threemode Team