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Probots Solid State Relay Module G3MB-202P SSR 5V, 4-Channel Buy
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SainSmart 4-Channel 5V Relay Module for Arduino Raspberry Pi
4 Channel 5V Relay Module - Wiki
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4-Channel 5V Relay Module - Solarbotics Ltd.
arduino 4-channel 5v relay module expansion board
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4-Channel 5V Relais/Relay Module with opto-coupler
