ValefodDC 5V Relay Module 1-Channel Relay Switch with Optocoupler Isolation High/Low Level Trigger, Pack of 10

I use it to add remote control capability to turn on/off a 1200W car inverter. Note that the relay doesn't handle 1200W! It was never intended, as the signal to turn ON/OFF the inverter is very low power. It is quiet when the relay activates. The printed circuit board of the module is solid, and has a light insulating coating layer.The wiring connector is a bit weak and feels cheaply made. Since once hooked up you don't make any adjustments so the cheaply made connectors are actually decent for its intended use, in my case.

The input isolation is confidence-inspiring. The reversible activation logic is a great feature, although it means you need 5V power to the relay at all times. Worked flawlessly with Raspberry Pi GPIO.The documentation could definitely be better though... the Amazon product page gi es yiu all the connection diagrams, although I would have preferred some printed sheet with the relay itself.

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Works as expected

It's well thought out. It's easy to control the relay from a low power processor pin - just a couple mA will do the job. You can select whether the relay is triggered by a Vcc or ground signal, and the relay itself is SPDT. It works fine at 5v.The board has a power LED, which is annoying because power drain is an issue with battery circuits, and a separate LED which lights when the relay is energized, which is more acceptable. They can be removed.The relay itself is small and won't switch high currents at high voltages, but you can easily use it to control small lights, little motors or a larger relay.Pleased.