I wasn't sure if I should have ordered this or not from Hiwill. I really just don't know much about ultrasonic cleaners like this. This ultrasonic machine has become one of those items my husband always says, "I need to see if there is anything on Amazon that I didn't know I couldn't live without". That always sounded funny to me but now I know what he meant. This is one of those items.It takes up very little space on my bathroom counter and fits just to the left of my sink. Although small, this cleaner performs just as claimed. I put a blacklight on it before and after it went through its cycle and the bacteria seemed to have disappeared. I use it every night for my retainers and just started trying it out on some of my jewelry. I used to have my jewelry cleaned at the jewelry store or at the local home shows where vendors offer to do it free. It makes a visible difference to me in how shiny and brilliant my rings are after I put it through a cycle.The settings are 300 seconds or 5-minutes and 600 seconds, or ten minutes, see my photos. UV light has always been a mystery to me in how it works, but it sure does work great in this case.My husband and I went to visit our kids and grandchildren for a few days, and I brought it with me. It's small enough to take on a trip without being annoying.In conclusion, this is a simple solution to the issues many of us have, cleaning dentures or mouth guards. This is the answer for that. This is an easy recommendation and it a 5 Star Review.