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Amazon.com: KEYESTUDIO 4 Channel Relay Shield 5V for Arduino Controller R3 ARM PIC AVR STM32 Raspberry Pi HIGH Level Trigger Relay Module Expansion Board : Electronics
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Amazon.com: SainSmart 4-Channel Relay Module : Automotive
Amazon.com: HiLetgo 12V 4 Channel Relay Module with OPTO-Isolated Support High and Low Level Trigger : Industrial & Scientific
YWBL-WH Relay Module One Way 30A Optocoupler Isolation Relay Module High Power Relay High/Low Level Trigger YYG-2(5VDC) (1): Amazon.com: Industrial & Scientific
3.3V 4 Channel Relay Module High and Low Level Trigger Dual Optocoupler Isolation 3.3V Relay Module: Amazon.com: Industrial & Scientific
Amazon.com: AOKLEY 5V 12V 24V Relay Module with Optocoupler Relay Output 1 2 4 6 8 16Way Relay Module 1Pcs (Color : 12V, Size : 2 Way) : Industrial & Scientific
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Amazon.com: Huayao 2pcs 4 Channel DC 5V Relay Module with Optocoupler for UNO R3 MEGA 2560 1280 DSP ARM PIC AVR STM32 Raspberry Pi : Electronics
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DC 5V 4 Channel Relay Module with Opto Isolation Supports High and Low Level Trigger with Optocoupler for Arduino: Amazon.com: Industrial & Scientific
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Amazon.com: ILAME 1 2 4 6 8 Channel 12V Relay Module Board Shield with Optocoupler Support High and Low Level Trigger for Arduino (Color : 4 Channel 12V) : Industrial & Scientific
Amazon.com: WMYCONGCONG 4 PCS XH-M131 Photoresistor Relay Module DC 12V Light Control Switch Photoresistor Relay Module Detection Sensor Automatic Light Control Switch with Cable : Industrial & Scientific
Amazon.com: Electronics-Salon 4 DPDT Signal Relay Module Board, DC 12V Version, for Arduino Raspberry-Pi 8051 PIC. : Electronics
