It can also connect to devices via Bluetooth. This product uses a USB connection and rechargeable lithium batteries for power. It is suitable for small spaces, such as office cubicles, and use while traveling. This white noise machine claims to be one of the smallest on the market, measuring 2 by 2.1 inches and weighing 6.4 ounces. More expensive machines may play a wider range of white and ambient sounds, such as ocean noise.
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