Air conditioning (outdoor unit):
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Sewing machine
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Electric wheelchair
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Cool sound for notification
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Air cut, Fan blade rotation
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Email message sound
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Defrost process, Spaceship freezer
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SMS notification sound
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Faulty air conditioning, vibration noise
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Spin, read, Hard disk
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Computer turning on, humming fan, off
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An electric toothbrush
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Air conditioning (outdoor unit)
★★★★★