Bests & Worsts Reviews from Amazon

I bought two of these, (one for my husband and one for my teenage son), since they would automatically reset themselves after a power outage. They both immediately complained that the alarms were not loud enough, (both are VERY heavy sleepers). It does have a very light and polite beep with no volume control. However, the beeps gradually increase in frequency and after week of use, both of them are waking up easily to the sound and without the jarring blasts from our old alarms. So, it may require getting accustomed to for heavy sleepers, but it's great for those of us who don't like to be blasted awake every day.