Module description:
1.The module Operating voltage 5V;
2.Fault-tolerant design, even if the control line is broken, the relay not operate;
3.The power indicator (green), the relay status indicator ;
4.Module size: 50mm x 26mm x 18.5mm (L x W x H).

Interface:
Input
VCC: Relay power supply +
GND: Relay power supply -
IN: Signal trigger input (High or Low Level Signal, select via jumper)
Output
NO: Relay normally open.
COM: Relay Common Pin
NC: Relay normally closed.
High or Low Level Trigger Select:
1. Use High Level Trigger
When ' °IN ' ± input High Level Signal, the ' °NO ' ± connect with ' ±COM ' ± When ' °IN ' ± input Low Level Signal, the ' °NC ' ± connect with ' °COM ' ±
2. Use Low Level Trigger
When ' °IN ' ± input Low Level Signal, the ' °NO ' ± connect with ' ±COM ' ± When ' °IN ' ± input High Level Signal, the ' °NC ' ± connect with ' °COM ' ±
3. High or Low Level Trigger Select
Jumper connect with L, Low Level Trigger
Jumper connect with H, High Level Trigger
Color: As Shown
Material: plastic

Package Contents:
2 x relay module