Air conditioning, on, off:
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Email message sound
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Sewing machine
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Off, Computer turning on, humming fan
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Air conditioning (outdoor unit)
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Hissing old tv
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Electric wheelchair
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Defrost process, Spaceship freezer
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Electronic melody for SMS alerts
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An electric toothbrush
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Android notification sound
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Whatsapp notification sound
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Air conditioning, off, on
★★★★★