It has a little tick tock sound while the tail is moving, but it didn't bother me... until it stopped after a few months. I would restart the tail and it would run for a short while (sometimes a few days), then quit again. The clock would still keep time, although it's far from the most accurate clock in my house.

Are Kit Kat Clocks silent?

How loud is it? Answer: The Classic Black Kitty Clock is not loud at all. As a matter of fact, I don't mind the noise it makes.

How does the Kit-Cat clock work?

Hanging on my wall, Kit-Cat maintains accurate time, but the eyes and tail refuse to animate? ... The clock animation is driven by a low powered magnetic field located opposite the magnet at the bottom of the clock lever. (The lever is the part to which the eyes connect at the top, and the tail at the bottom.)