Precise Volume & Timer Settings:With 32 Levels of Volume ,it is perfect for you and your baby sleeping .Just easily to set 1 hour,2 hours,3 hours,and continuous play,control the comfort level for your unique environment.40 Non-Looping Sleep Sounds:White noise,lullabies,piano,frog,fan,brook, rain, bird and waves, bonfire,train,crickets and so on,suitable for for baby and kids and adults,help you to mask disruptive environmental noises.18 Months Warranty & 100% Satisfaction Guarantee: 18 months warranty for the white noise machine from the date of purchase.Any issue just dont hesitate to contact us.Function & Safety:Memory function automatically restores your previous volume, sound and time,it is powered by AC or USB.The machine is approved by FCC, CE and RoHS,don't need to worry about accidents.Automatically Restore:This sound machine is 3.9 inch*3.93 inch*2.3inch,it is portable for home, office or travel,can give you a perfect sleep.