Air conditioning, on, off:
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Air conditioning (outdoor unit)
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Email message sound
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Electric wheelchair
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Sound to start presentation
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Faulty air conditioning, vibration noise
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Portable fan
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Off, humming fan, Computer turning on
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A vacuum cleaner
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Spaceship freezer, defrost process
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SMS notification sound
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An electric toothbrush
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Electronic melody for SMS alerts
★★★★★