I have a 20 year old alarm clock that has the most annoying buzzer ever invented. I think the radio still works, although I haven't turned it on on purpose in over a decade (my cat turns it on more than I do). Luckily I usually wake up before my alarm, but if that buzz doesn't wake you up right away I doubt anything will. I never had to use the snooze on it because the buzz does such an amazing job of getting the heart rate up. That thing is freakin obnoxious, at any volume.