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1Pc ESP8266 4 Channel Wireless WIFI Relay Module -DC Switching Power Supply Module ESP-12F Wifi Development Board For Arduino

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3-Channel Relay Module 5V with Optocoupler for Arduino Control Supports Low Power Trigger and High Current AC/DC Load Handling

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5V 2 Channel Low Level Trigger Relay Module with Optocoupler Smart Home DIY Expansion Board Compatible with Arduino ESP32 Microb

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RCmall 10PCS 1 Channel Relay Module 5V Low Level Trigger Interface Board Shield DC AC 220V PIC AVR DSP ARM MCU for Arduino

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Modbus RTU Relay Module 7V 24V RS485 TTL 1 Channel Input Output with Reverse Polarity Protection for Arduino PLC

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10PCS 5V 12V 24V Relay Module 2 Channel Relays Low Level Triggered 2-Way 2CH Relay Board With Optocoupler Expansion For Arduino

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12V 5V 16 Channel Relay Module Interface Board For Arduino PIC ARM DSP PLC With Optocoupler Protection LM2576 Power

LCUS 1 2 Channel USB Serial Relay Module PC Computer PLC Intelligent Control Switch for Arduino Smart Home