12V 1 Channel Relay Module With Optocoupler H / L Level Triger For Arduino Feature: Working voltage 12V High / Low level changeable Normally open interfaces maximum load: AC 250V / 10A, DC 30V / 10A Using SMD optocoupler isolation, driving ability, stable performance Trigger current 5mA Fault-tolerant design, even if the control line is broken, the relay will not operate The power indicator (green) , the relay status indicator (red) The interface design of human nature, all interfaces are available through a direct connection terminal leads, very convenient Size: 4.9 × 2.5 × 2cm Module interface: DC : positive power supply (VCC) DC-: negative power supply (GND) IN: can be high or low level control relay Relay outputs: NO: normally open relay interface COM: common interface relays NC: normally closed relay interface High and low level trigger options: It is low level trigger when jumper connect to LOW pin It is high level trigger when jumper connect to HIGH pin Package included: 1 × 12V 1 channel relay module