Information for "drip" sound ...

I bought three of these smoke detectors. I can confirm the "drip" sound. Every 10 seconds you can hear a very faint "click" from the built-in speakers, which should give the beep in case of fire. Really sounds like a water plug, but a bit quieter I would say. As annoying I would not describe the sound, even though I so have a smoke detector in the bedroom. One can only perceive the sound when there is absolutely no ambient noise.

Nevertheless, I would rate the smoke detector as well, even if he is far (fortunately) not yet had to demonstrate in action with me. He is really very small and looks good. About a button on the smoke detector can test its function. The warning sound is pretty loud, as you should already be awake from when the unit starts. About the price can certainly argue. If you do not mind to have a larger block on the ceiling you can also certainly reach for a smoke detector 5-10. The function is indeed the same.