DC 12V 4 Channel Relay Module Optocoupler For Arduino ARM AVR DSP PIC MSP AC 250V 10A DC 30V Low Level Signal MCU PLC Control 100% brand new and high quality This is a 12V 4-Channel Relay interface board Be able to control various appliances, and other equipments with large current It can be controlled directly by Micro-controller (FOR Arduino , 8051, AVR, PIC, DSP, ARM, ARM, MSP430, TTL logic) 12V 4-Channel Relay interface board, and each one needs 50-60mA Driver Current Equiped with high-current relay, AC250V 10A ; DC30V 10A Indication LED's for Relay output status Input IN1, IN2, IN3, IN4 signal low level effectively VCC, GND power input end, can supply power alone Application: Supports all MCU control The industrial field PLC control Smart home control Size: 7.5*5.6*1.8cm/2.95*2.2*0.7" Feature: 1 x 4 Channel Relay Module