30pcs 1 Channel 12V Level Trigger Optocoupler Relay Module For Arduino
1 channel relay module, with photoelectric isolation
High or Low level changeable(by a jumper setting trigger)
The module uses genuine quality relay
With power and relay acof earth wire
High Level Mode: the jumper is set between com and gnd (original).
Low Level Mode: take down the jumper, connect VCC to VCC, GND to Control Terminal, IN to 5V, COM to GND.
30 x 12V 1 channel relay module