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Amazon.com: RadioShack 12VDC (3-16V) Piezo Buzzer : Industrial & Scientific
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Amazon.com: 10Pack Active Piezo Electric Buzzer Alarm DC 3-24V Electronic Buzzer Alarm Continuous Sound Beep : Electronics
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Amazon.com: 3-pack 27mm Piezoelectric Disk Elements (Contact Pickups) with 2" Leads : Musical Instruments
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