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Hailege 2pcs DC 24V 2 Channel Relay Module with Isolated Optocoupler High and Low Level H/L Level Trigger Module Triggered by DC 24V : Amazon.de: Computer & Zubehör
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Amazon.com: ARCELI 5PCS 5V One Channel Relay Module Board Shield 5v Relay Module for PIC AVR DSP ARM for Relay : Electronics
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250V/10A 1 Channel SPDT Power Relay Module 5V Control for DIY PIC AVR DSP ARM MCU: Amazon.com: Industrial & Scientific
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5V DC Delay Relay Turn on/Turn Off Module, Delay Relay Delay with Timer Turn on/Delay Turn Off Switch Module (5V) - Amazon.com