my 17 year old daughter be invite to attend she last two year of high school away from home . she be incredibly smart and we just could not pass up the opportunity for she . the only problem be , be away from home and have nobody to make she get up , she be constantly oversleep ! we shop for all sort of alarm clock for she , always buy the one that be advertise as be the loudest . after she second detention for miss class and\/or be tardy I decide I have to find something that actually would wake she up . well , I find it . she have now have this alarm clock for a little over a month and have not oversleep once !! she say the first couple of day it scare she half to death , but this be not one of those alarm that just buzz and she never hear . she put the part that vibrate under she pillow because put it under the mattress be not a option with the way the dorm bed be construct . I highly recommend this product to anyone who have a child like mine who do not hear traditional alarm clock !! one less worry for I as a mother have a child live away from home .