Description: 1. The module uses genuine quality relay , normally open interfaces Maximum load: AC 250V/10A, DC 30V/10A; 2. Using SMD optocoupler isolation, driving ability, stable performance; trigger current 5mA; 3. The module voltage is 12V/5V/9V/24V are available; 4. The module can be set to high or low triggered by jumper; 5. Fault-tolerant design, even if the control line is broken, the relay will not operate; 6. The power indicator ( green ), relay status indicator ( red ); 7. Interface design humane, all interfaces can be connected directly via terminal wiring leads, very convenient; 8. Module Size: Approx. 50mm * 26mm * 18.5mm ( L * W * H ); 9. Has four mounting bolts holes, hole 3.1mm, 44.5mm * 20.5mm pitch. Two Module Interface: 1. DC +: Positive power supply (VCC)( voltage required by the relay, 12V/5V/9V/24V ); 2. DC-: Negative power connection;(GND) 3. IN: Can be high or low level control relay. Relay Outputs: 1. NO: Normally open relay interface, the relay before the vacant after the pull shorted with COM; 2. COM: Common Interface Relays; 3. NC: Normally closed relay interface relay shorted with COM ago, after the pull- vacant. High and low trigger selection ends: 1 short jumper with LOW LOW triggered when connected ; 2 When the jumper is high with high short trigger. Package Including: 1 x One 1 Channel Relay Module DC 5V 9V 12V 24V High and Low Level Trigger Relay Control Board with Optocoupler