10 most useful high quality natural sounds: White Noise Rain Bird Brook Lullaby 1 Lullaby 2 Ocean Typhoon Thunder and Brown Noise. Excellent for noise-masking and creating a comfortable background sound in instances where it might be too quiet.</br>Compact & Portable: This sound machine is compact and portable making it the perfect white noise device to take with you on your next business trip vacation or family adventure.</br>Optimal Sleep Timer:15306090minutes or a full night sleep timer for optionallows you to decide how long the white noise or lullaby is played in the background. If you want to use it all the nightpls do not set the timer.</br>Use it ANYWHERE: Built as a sound therapy machine this white noise machine is perfect for baby nurseries day care centers college dorms apartments hotel rooms office spaces or any environment where unwanted and disruptive noises are present.</br>USB cable includedcan Also use 4*AA batteries (not included)</br></br>Product Description</br></br><b>KEDSUM White Noise Machine?? Aiming to provide you the health and happy life</b><br><br> <b>Functions:</b><br> 1.Cover up the external noise?? to create a stable sleep environment.<br> 2.Create a sleep environment?? to achieve deep sleep.<br> 3.White noise can effectively shield snoring?? don't need to wear anything to shield the snoring.<br> 4.Portable sleep sound machine??you can take it on your next business trip?? vacation?? or family adventure.<br> 5.Help you to focus on your attention?? improve your learning and working efficiency.<br> 6.Reduce your pet's anxiety caused by sudden shock?? such as fireworks or thunder rumbl