I have always have problem wake up to alarm clock ... I be a extremely deep sleeper . I use my IPhone , iPad , I pod , cell phone , and two other alarm clock . this be a outstanding product ! it wake I up just like I be hope it would . it be extremely loud and even have a vibrate attachment . Fair warning : I would not recommend put it under you pillow like some people do because it get very hot . I put the vibration attaachman on the nightstand and it work remarkably . it make a even louder noise . FINALLY SOMETHING that work !