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Amazon.com: Electronics-Salon 4 DPDT Signal Relay Module Board, DC 12V Version, for Arduino Raspberry-Pi 8051 PIC. : Electronics
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3.3V 4 Channel Relay Module High and Low Level Trigger Dual Optocoupler Isolation 3.3V Relay Module: Amazon.com: Industrial & Scientific
SainSmart 4-Channel Relay Module
JBtek 4 Channel DC 5V Relay Module for Arduino Raspberry Pi DSP AVR PIC ARM
JBtek 4 Channel DC 5V Relay Module for Arduino Raspberry Pi DSP AVR PIC ARM
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Amazon.com: SainSmart 8-Channel Relay Module : Automotive
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SainSmart USB 4 Channel DC 12V Relay Module Automation for Arduino Raspberry Pi DSP AVR PIC ARM: Usb Relay Board: Amazon.com: Industrial & Scientific
Vogurtime 4 Channel 5V Relay Module with Optocoupler Isolation Support High and Low Level Trigger Relay Red Board
