?PORTABLE SOUND MACHINE??---- White noise sleep sound machine is an ideal for Home office and traveling. It can be easily put into your bag or suitcase, no matter where you are, you can carry it, creating a familiar sleeping environment for adults, children and babies, and you no longer have to worry about your sleep quality. ?9 SMOOTING NATURAL SOUNDS??---- white noise, ocean, thunder, soothing music, wind, brook, summer night, rain, bird. It can help you eliminate disturbances and create an ideal environment for sleep, relaxation or concentration. It's very easy to choose the sound you want. ?VOLUME CONTROL & 3.5MM HEADPHONE JACK??---- Compared with other fixed decibel sleep machines, our sound therapy can solve this problem well, allowing you to adjust the volume that suits you, and if you don’t want to affect other people , You only need to connect the headset to the sound relaxation machine. ?AUTO-OFF RIMER & USB/AA BATTERY POWER??---- Timer function (15, 30, 60 minutes automatic shutdown timer), so that your white noise machine can be adjusted or turned off in the dark. It is suitable for USB cable and 4 AA batteries (not including batteries) power supply mode, very suitable for carrying. ?EXCELLENT CUSTOMER SERVICE??---- If you have any questions or issues do not hesitate to contact us.If you are not satisfied with our products, you can get returns and money back within 30 days. We assure you that we will give our best attention to any inquiries from you