• Ah, i'm now thinking maybe it doesn't have that component?

    Most likely this will be the case. The company that manufactured these didn't do a very good job with QA or didn't even care.

    That's why there is an option in the settings (beep->vibrate) to use the vibration motor for audio, though it is not as loud. On the other hand, the piezo probably wouldn't have been significantly louder.

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