Others are more old-school and must be plugged in at all times. That makes them much more portable for travel or convenient to move to different spaces throughout your home (though you can also often plug them in on your nightstand or dresser for more stationary use). Power source: Some sound machines have an internal rechargeable battery or will run on standard AA batteries. Some are much more aesthetically pleasing than others, though, and we’ve taken that into account too. Size and style: Ideally, a sound machine that takes up space in your bedroom will be, at the very least, somewhat compact and unobtrusive, and easy to fit onto a dresser or nightstand. But some modern sound machines offer white noise as well as a wider array of aural delights, like the sound of ocean waves crashing or crickets chirping. As such, sleeping with a sound machine turned on can be akin to having a box fan blowing in your bedroom - and indeed, people who run hot and don’t need any frills may prefer an actual fan to a more specialized sound-focused device. At their absolute simplest, sound machines typically make a consistent and even-toned whirring fan or static-y radio sound that’s intended to mask more disruptive and specific noises like people talking or a dog barking. Sound type and variety: A sound machine can generate sound either mechanically, via physical components moving inside it, or electronically.
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