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Any ideas on a small Super Loud Speaker? What is used in “personal alarms”?

<*** class="md">Hi,

I'm looking for a small form factor, but super loud speaker/buzzer or whatever. So I can use it for when I loose a RC airplane. I know these "personal alarms", as seen in image below has very loud speakers, advertising up to 130 dB (even though it might be BS, theyre still extremly loud), and are wondering exactly what components they use to get such a loud noise from it.

I could buy one and rip it apart, but rather get the actual components instead if anyone got a clue.

submitted by /u/Right-Bodybuilder-18
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