Cool device, the housing of the slow-speed engine is made entirely of metal. Unfortunately, the impression is spoiled by sloppy assembly, specifically the casing smeared with some glue. You can't wash it off with alcohol, petroleum ether or acetone, which is probably some epoxy resin. Therefore, I am subtracting one star.Works decent but for supposedly having 50k frequency, I was expecting more power, deeper clean.This little cleaner packs a big punch. The packaging was simple and the function and use was even easier.It cleans. My wife is a former jewelry clerk and used to clean jewelry daily. She keeps her jewelry pretty clean, despite not having a sonic cleaner until now. This thing made her normally clean rings and diamonds shine!Speed is right, construction seems robust, cleans up to five albums at a time, six if you get slightly thinner spacers from your local hardware store without noticeably different performance.It’s seemed under powered and could have a variable timer or just a longer timer.Very disappointed. I need this cleaning for my dentures, but it didn’t any difference from Polidemt tablets. Olso not cleaning silver chain ot glasses. Practicle not doing what was promised.Thank youMy wife has some jewelry she likes to keep clean, and pre-covid, it wasn't a big deal. We would go to the store, drop off the jewelry, do some shopping, and by the time we were done, all her pieces had been cleaned and were ready to go. Because of the lockdowns though, I started to look into ways we could do that cleaning at home. That's when I found this ultrasonic cleaner.Before I tried it out, I thought it would be (near) silent, since "ultra-sonic" means frequencies above human hearing. With this cleaner, I found out that apparently it also involves frequencies that people can hear. Since this is the first time I have done the cleaning at home, I'm not sure if these sounds are typical of cleaners like this or if this one is louder or quieter than the norm.Operational sound aside though, it cleaned my wife's jewelry very well (we used detergent meant for that type of cleaning). Overall, I'm happy with the results and the sound level is not a deal-breaker for me.I used to clean gold jewel and optics. Works well! Value for money