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1.Two relays on board, can control shutdown independently 2.Supply voltage:3.3V&5V; Relay allows access to the load:250V/5A 3.With relay working indicator, it is convenient to check the working status of the relay 4.Optocoupler isolation circuit, strong anti-interference ability, stable work 5.Suitable for Raspberry Pi Zero/Zero W/Zero WH/2B/3B/3B+/4B、STM32、Arduino etc; Open source demo codes available for Raspberry Pi