My concern when I ordered this clock was that the vibration would not be strong enough to feel. I didn't say "hear" because I plug my ears when I sleep as my wife snores badly. It was music at first, but listening to the same tune every night gets old -- you get the picture. I was impressed by the strength of the vibration. The clock comes with standard instructions, but I set up the clock without reading it. It's a clock, not a rocket! I recommend this vibrating clock highly. The clock has a lock in the back which I use to prevent accidental change of settings. I tuck the clock slightly under the edge of the pillow for better vibration. Great product.