We purchased this for our 9 year old son who has rarely had a dry night in his life. We tried another alarm 2 years ago that had a big pad type device he had to place in his pullup, it was very uncomfortable and once wet could not be used again that night and also trying to clean and dry it privately without siblings seeing it was rough. With this one the results were unbelievable, we had him wear a pair of underwear clip it on and wear another pair of underwear over it, because they suggest the clip (which is very small and never bothered him) needed to be between two fabrics. He woke to the alarm (which we used alarm with vibration) very wet 2 times a night for 3 days and then the rest of the week he was waking twice a night to the alarm with barely a wet spot, the second week he woke once a night for 2 days to the alarm very wet and a couple totally dry nights and barely wet nights. This was also the case for week three. My son has now been DRY for 2 1/2 months. I can't tell you how proud this has made him, and giving him his freedom from worry that someone would find out, I am so grateful. My son also who never could hear the other alarm never had a problem waking to this on his own, he even ended up in the final week just using the vibration. It amazed me how sensitive the alarm was to pick up just a hint of wetness and how my son would stop and wake up. This has changed our lives.