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Seco 50Hz 2DC Plus 1 AC Multitone Buzzer
12/24v Reverse Accessories Beeper Horn Vehicle Auto Warning Back Up Car Reversing Alarm Speaker Buzzer Siren With Light For Cars - Multi-tone & Claxon Horns - AliExpress
50 Hz 12V Multi Tone Electronic Buzzer, Size: 100x60mm
RS PRO ≥105dB, Wire Leads Continuous, Slow & Fast Pulse Internal, Magnetic Buzzer Component, 6V dc up to 28V dc - RS Components Vietnam
arduino uno - Multiple tones with one piezo buzzer - Arduino Stack Exchange