Elegoo 4 Kanal DC 5V Relaismodul mit Optokoppler für Arduino UNO R3 MEGA 2560 1280 DSP ARM PIC AVR STM32

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;