Polar Night white noise machine is a handy aid for getting sleep. The machine is suitable for users of all ages. The machine has 28 different calming sounds to help you relax and sleep more soundly. The sounds are also accompanied by different lights. The rechargeable battery provides easy portability and allows the device to be used for up to 10 hours with a single charge. The Polar Night white noise machine also has a headphone jack, night light function, 32 volume levels and a timer and memory function.