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SELLCOM Windtone Jalwa Horn Set Universal for Car/Motorbike| 12V, 105-118 dB, 400/500 Hz| High Loud Sound Air Siren| High + Low Tone| 560 GM| 9.5x10x9 CM| Pack of 2| Black : Amazon.in: Car & Motorbike
1000Hz is used in acoustics as reference frequency for testing. What is special in it, why not 688.5Hz or 440Hz? - Quora
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