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1 Channel Relay Shield Module, 10PCS DC 5V Indicator Light LED Module for Arduino R3 MEGA 2560 1280 ARM PIC AVR STM32 Raspberry Pi MCU DSP Official Boards Shield (10PCS): Amazon.com: Industrial
Amazon.com: HiLetgo 2pcs 5V One Channel Relay Module Relay Switch with OPTO Isolation High Low Level Trigger : Industrial & Scientific
Amazon.com: 5vdc (5 Volt DC) Relay - DPDT PCB 8-Pin Mount - Non-Latching Non-Polarized Electronic Low Signal High Sensitivity Relay Module for DIY Electronics and Arduino : Industrial & Scientific
YYG-2 One Way Relay Module, High Power One Way High/Low Level Trigger Optocoupler Isolation Relay Module 30A YYG-2(5VDC): Amazon.com: Industrial & Scientific