This fan sound system is perfect for home use or travel. You can use the machine for relaxation, study and speech privacy. It also works as a personal white noise machine that ensures a great night's sleep! Choose from 10 different fan sounds or 10 different white noise sounds. all sounds have the ability to be personalized with pin-point volume control so you can select across a wide range of sound levels from whisper to extra loud. There are even two power options, AC and Power USB.