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1 Channel Relay Module with Optocoupler 5V Low Level Trigger Relay Expansion Board for Arduino UNO R3 DSP ARM PIC AVR STM32 Raspberry Pi - DK, JDQ1 DK JDQ1 This Module Not Only Used As A Microcontroller Development Board Module, But Also As A Home Appliance Control. The Module Conform International Safety Standard, The Isolation Groove Between Control Area And Load Areas. The Double FR-4 Circuit Board Design.With Optical Coupling Isolation, Triggering More Reliable, More Stable. With The Power Supply And Relay Instructions, Pull Off, Disconnect Does Not Shine. The Control DC Or AC Signal, You Can Control 220V AC Load. Package: 1pcs Relay Module

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