Drift off to dulcet tones with the Sleep Therapy White Noise Sound Machine Features 9 x different audio sounds Includes: ocean, thunder, music, white noise, wind, brook, rain, birds and summer light Simple to use with rotary style button  Power with 4 x AA batteries and a USB Choose between continuous sound or auto-off timers Dimensions: 4.8" a 2.5" Supports headphones so you don't ned to disturb anyone else Please see Full Details for specifications  Save 71% on the Sleep Therapy White Noise Sound Machine for 19.99 pounds