The Official Sound Conditioner of the National Sleep Foundation - this is what Serious Sleep is all about. The asymmetrical fan creates a soothing sound of rushing air without moving actual air. This natural white noise" sound has been proven to effectively block noises at a broad range of tones so you can get deep undisturbed sleep all night long. Features: Up to 75dB amplification Two speeds Fully adjustable tone and volume control Simple twist operation Integrated vibration dampening rubber feet for improved sound quality A/C Powered Dimensions: 5 3/4" base diameter 3 1/4" high Warranty One year limited warranty Brand Marpac Product Type Tinnitus Masker UPC 036005002404 What's in the Box Dohm with electrical plug attached