The timer is about 3-1/2 inches in diameter. The high volume could have been a lot louder, but that's the only thing I would like to improve at the moment. Comes with a set of simple instructions. Requires three AAA batteries which are NOT included. Minute numbers are approximately 1-1/2" high and seconds numbers are approximately 3/4" high making them very easy to read day or night. I don't use the magnet function, so I can't comment on that. So far I am happy with the purchase but if my mind changes I will add a review.
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