Redditor Siguchi suggested that a DualSense gamepad could demagnetize a mechanical watch. The assumption appeared after measurements of the gamepad’s magnetic field near its elements.
So the player found out that the magnetic field is expectedly strong, not only near the speaker, but also near the handles. He compared the strength of their field to the strength of the field of full-fledged speakers installed in laptops, which are really capable of demagnetizing a mechanical watch.
But later, the user conducted additional tests, measuring the magnetic field near the wrist, on which people wear mechanical watches. There the field turned out to be much weaker and within normal limits. The player and the commentators under the post came to the conclusion that the magnetic field is still not so dangerous, but it is better to take off the watch if you like long gaming sessions.