Old Reliable
I still have the alarm clock that I got for my high school graduation in 1992, and it still wakes me up every day. I have moved 15 times, and it has woke me up almost 10,000 times. My favorite thing about it is that it has a touch pad on top instead of a snooze button. (Like a touch lamp.) In almost 30 years, I have never found another one like it. The company that made it went out of business years ago.