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JBtek 4 Channel DC 5V Relay Module for Arduino Raspberry Pi DSP AVR PIC ARM5V Relay Module 4-ChannelThis is a 5V 4-Channel Relay interface board. It can be controlled directly by Micro-controller (Raspberry Pi, Arduino, 8051, AVR, PIC, DSP, ARM, ARM, MSP430, TTL logic)Features of JBtek 4 Channel DC 5V Relay Module for Arduino Raspberry Pi DSP AVR P..