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These modules have no mechanical parts and no annoying clicking noises when switching. Because it has no mechanical parts it will last much longer.
This is a high-level trigger unit and will work well with microcontrollers.
5V 2 Channel Solid State Relay Module 250V 2A Features:
interface:
Input section:
DC +: positive power supply (Power 5V to Module)
DC -: negative power supply (Power 0V to Module)
CH: Relay signal to trigger the channel (Active LOW)