This is an industry I/O Module.

It is used to trnsmit the ON-OFF condition wirelessly.
You can also use it to control ON-OFF condition.

8-way digital isolated input, high reliability and stability.

8-way relay dry contact output, contact current is 220V, 5A.

Collocated with a 2km-3km RF module inside;

Frequency: 433MHz (400MHz/450MHz/470MHz)

Power output: 500mW

Receiving current: 60mA;

Transmitting current: 350mA

Power supply: DC 12V-30V

Dimension: 145mm*90mm*40mm