Hilitand 12V Adjustable Time Delay Relay Module, 0-25Sec, Normally Open, Mount, Electrical Timer

Nice 555 timer circuit.

Works as described.

It worked as expected as soon as power was connected. One drawback - in the instructions it says you can change the timing capacitor to change the delay range. Theoretically that's true, but when I tried unsolder the existing capacitor, the via barrel pulled out. For the ordinary user, that would have been the end of the board, but I able to put in my new capacitor and add a wire to make the connection the via barrel used to make. That's my only gripe. It's got a nice relay that looks like it can handle a substantial electrical load.

It seems to work overall except the potentiometer adjustment just doesn't work. I tried moving it around, and you pretty much get 5 seconds or "always on." Moving the potentiometer adjustment just throws it for a loop and it just never times out. I will likely still use it, but I wish the adjustment was a bit more precise.

This nicely made small timer module fit well in my application, a very simple one that requires a timed relay closure when power is first applied. Board markings are rather oddly in Chinese, but the published data helps with that. Recommended.

Completely didn't work.

The module works as listed. Which is not actually what I want on one aspect. I overlooked the detail that the relay energizes when power is supplied to the module. Then reverts back to neutral configuration on the relay till it is triggered again. The form factor is just what I needed but because of this little startup issue I am unable to use it for this project.

This item comes with no documentation, instructions or directions of any kind. Use or connection is at the risk of destruction of your device.