Looking for sensor

I am looking for guidance in my project.
Looking for a small device that could send a vibrate signal (2 bzzz) on demand. It has to be really small as it will be on clothes. It is a sports project to send a buzz on certain alerts.
Does anybody have any clues about vibrating sensors?

I believe you´re looking for buzzers, but the most common ones format is not that good to be on clothes.

Maybe you can try SMD versions somehow. This is an example: MLT-8530 SMD 3.6V

This video might bring you some ideas too.
https://www.youtube.com/watch?v=egLA0GgF3xw

Not a sensor (they're input devices).
Try motors with off-balance weight, used for pagers. Something like:

or maybe

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