This alarm clock has really solved my biggest problem of all. Like many others, I too have the problem that I put my alarm clock just do not hear in the morning, and then only after 1ner hour, although I had are in the form of my smartphone, my tablets, radio alarm clock and Ipods 4 alarm clock with disturbing sounds to transport clients, where usually 2-3 morning should do their job. So I googled for tips and other people the same problem as I did, what I ended up on a page for the deaf, in which there was vibration watches etc. When I typed vibration alarm at Amazon, I landed directly in Sonic Bomb, which looked to me because of the vibration part of the ceiling directly to the solution for all problems. Because of the good reviews I ordered the thing right and what can I say? - That part is awesome, and I have not slept since. I have every morning ONLY the vibration function as a wake-up call and the vibration part under my pillow, thus I will always instantly awake !!! A vibration creates what 4 alarm not managed with high-pitched tones. I am really very happy with the alarm clock, because the workday is nothing more embarrassing than to oversleep. I can only recommend to anyone who does not hear his alarm clock in the morning to add itself this part, strong buy recommendation !! What I also find very well that the clock display is large, can provide light, and while raising the morning flashing red lights on the clock display!