Outstanding white noise sound machine with Optimal Sleep Timer & Breathing Light! It can be set a 20 40 or 120-minute automatic shut-off timer to conserve energy while you sleep. The soothing sound of rushing air quiet your mindand the Soft yellow light go dark and lights up rhythmically like human breathing which creates a peaceful atmosphere to help fall asleep faster.</br>Customized Sound Therapy: Built-in dual mute speed motor to adjust the volume of white noise accordingly. Acoustic housing and dual speed fan for a bountiful selection of white noises enables fully adjustable tone and volume control for a personalized sound environment.</br>Portable & Widely Used: Convenient usage - compact design makes it the perfect way to carry on in business trip vacation or family adventure. Widely used on various occasions - baby nurseries day care centers college dorms apartments hotel rooms office spaces or any environment where unwanted and disruptive noises are present.</br>Additional Function: Charging equipment - The machine is equipped with 2 USB charging ports (DC 5V1A) can be used to charge your cellphones?? wireless earphones?? tablets or other USB powered devices.</br>Safe Guarantee: FCC & RoHS & UL certifications?? design according to National Sleep Foundation. Buy without worry as Pictek offer 18Months warranty and 45 days money back guaranty. If you are not satisfied??please contact us dirrectly