Tell-Tale Heart

I'm sorry, I do not understand your question. Pease rephrase. 

Of you're looking for the sound of the watch, please read the quote below.

And now have I not told you that what you mistake for madness is but overacuteness of the senses?—now, I say, there came to my ears a low, dull, quick sound, such as a watch makes when enveloped in cotton. I knew that sound well too. It was the beating of the old man’s heart.