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This is a 5V 8-Channel Relay module, It can be controlled directly by a wide range of microcontrollers such as Arduino, AVR, PIC, ARM and MSP430.
1. Each 5V Relay need 20mA driving current
2. 5V TTL control input which can be directly controlled by Arduino, AVR, PIC, ARM and others.
3. Indication LED for each Relay's Status