Relay Module 4-Ch 12V with Optocouplers.

4-Channel relay module.
Inputs Gnd, Vcc (12Vdc), channel select signal 1-4. Channel activation HIGH/LOW selectable by jumper links - 5V logic compatible.
Channel signals are optically isolated from the relay coils.
3-way terminal blocks connect to SPDT changeover relay contacts.
Relay contacts rated at 10A 250Vac, 10A 30Vdc.
Relay coils 400mW each.