4 With Optocoupler(Blue) This is a 5V 4-Channel Relay interface board. Be to control various appliances, and other equipments with current. It can be controlled directly by -controller ( , 8051, AVR, PIC, DSP, ARM, MSP430, TTL logic) . 5V 4-Channel Relay interface board, and each one needs 50-60mA Driver Current. Equiped with high-current relay, AC250V 10A ; DC30V 10A. Size:7*5.3mm Material:CCL Indication LED's for Relay output status. Application: Supports all MCU control. The industrial field. PLC control. control. Package Included:1X 4 Channel Relay Module DC 5V With Optocoupler For PIC ARM AVR Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.