4 Channel DC 5V Relay Module with Optocoupler for Arduino UNO

Description

4-channel relay output modules, relay output contacts 250A 10A.
Input IN1, IN2, IN3, IN4, the signal line LOW effective.
VCC, GND power input, can relay a separate power supply relay power input of JD-VCC.

Uses:

1, support all MCU control.
2, the industrial sector;
3, PLC control;
4, smart home control;