Fall asleep more peacefully with Zenergy soothing sound therapy and the meditative eff ects of the renowned 4-7-8 method inspired by yoga breathing techniques. The iZ2 features 8 diff erent white noise and sound therapy tracks designed to calm your mind, lower your breathing and heart rate, and prepare your body for sleep. The iZ2 also features a convenient aux-in jack with included cable to listen to your favorite music and meditation apps. Powered by 100-240V AC adapter (included) or 4 AA batteries (not included) for portable use.