Weewooday15 Pieces 5V Relay Module 1- Channel Relay Control Boards with Optocoupler Isolation High and Low Level Trigger Expansion Board

These are fine, and what was delivered is what is shown in the photos. When looking at this or other units, just take note the size of the PCB if that is of any concern to you. I'm trying to use some of these for home automation and there are a few variations that take up less room than this board. I'd prefer to have the low voltage side screw terminal and jumper included in the package to use optionally, so you could omit it if you'd rather solder wires directly to the board instead. That would make the unit a lot lower profile on that end. This would enable you to use two relays in just slightly more space than one takes up right now (face to face, reversed, with low voltage wiring coming out the center and high voltage AC inputs on the ends).

Over the course of years some have stop working at about the mark of three years, but I have used them for a quit strong and regular cycles. Only one out of 35 was dead on arrival, more than half are still operational.

As advertised

I did not test the AC electricity amperage capability. I only tested if the relays mechanically were tripping and functioning properly with a test signal as designed. I wired up a simple test harness to test all these units that came in the box. I was excited to have 15 AC relays to design projects with. First relay wired in and the mechanical switching took place and it worked. I was happy. That was the single packed of relays. All other packets came two taped together. When I opened the second packet the first relay on the test harness failed to function. The power LED and the SIGNAL LED came on as expected but the mechanical relay did not trip and close the circuit and my test LED did not therefore light up. I tested the next relay in the second packet and same thing dead mechanical relay. I opened the next packet of two and they both worked perfectly and the relays clicked and my test LED lit up as it was designed to on the test harness. Long story short I tested all 15 relays in the box of 15 relays I ordered. 5 relays were dead on arrival and not working, only 10 relays were working. I don't know if they can safely relay the AC electricity marked on the relays as my test harness is only connecting an ultra low 3.3 volts through the relay to my test LED light. So that is a 33% failure in a box of "brand new" relays. Back to Amazon, I will replace and test the new relays and if they don't have failures in the box I will update and change this review.UPDATE 3/12/2022 - The replacement box of 15 AC relays arrived. I tested them all. 2 dead AC relays out of the box and 13 working AC relays. Much better than my first box but it will take ordering more boxes than you need for a project if every box has at least 1 dead AC relay to make sure you can finish your project on time.

Great value!

Screwheads on an entire batch were too tight, so tight, in fact, they could not be turned. Had to return.

I like the size and the amp handling capacity of these relays . I will connect these to my multi color LED switches. I am building a truck camper project and these relays will controll Ac and Dc cuircts.

Good relay for any project. Triggering with low or high state 3.3V input