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1.Supply voltage:3.3V&5V;Relay allows access to the load:250V/5A 2.With relay working indicator, it is convenient to check the working status of the relay 3.Optocoupler isolation circuit, strong anti-interference ability, stable work; 4-CH relays on board, can control shutdown separately 4.Based on Raspberry Pi 40PIN GPIO header design, applicable to Raspberry Pi series motherboard 5.Open source demo codes available for Raspberry Pi