{20 Soothing Sounds} This white noise has 20 kinds of sounds to choose from so you can mix it up and not get tired of the same sound. There are 9 nature sounds, 5 light musics, 5 white noises, 1 fetal sound, which not only do the sounds help you fall asleep, but they also mask other environmental sounds, e.g, your neighbors, dogs, loud fans, room mates, etc. It is ideal sleep tool for kids and adults especially for travel as when traveling and help you tend to sleep as well in unfamiliar plac {30, 60, 90 Minute Timer Function} For safe, eco-friendly use & efficient, the white noise speaker can be played continuously or be set with a timer for 30, 60, or 90 minutes, which means that the noise machine automatically shuts off and stops playing sound after a desired amount of time, helping to create a better sleeping environment, relieve stress and anxiety, and promote calmness and relaxation. {Portable & Compect Design} This white noise come with a the buttoned silicone strap for hanging at the top, it allows you to place the device in various areas securely. such as you can use this silicone strap to hang the noise unit off the headboard of your bed, or in the crib, car seat, stroller. On the other hand, the noise machine is lightweight (only 0.46 lb) and small size: 7.6*5.8*3.0(cm), so, you also can put it into your bag, luggage and pocket. {USB Rechargeable} Charging with a USB C port as well as including a USB cable, it built in 1000mAh long lasting battery: More than 45 hours of continuous playback (up to 16 volume levels) and more than 107 hours of continuous playback (8 volume levels) on a full charge. So, you don't have to worry about running out of power, providing you with a comfortable environment for babies and adults to sleep peacefully, and for adults to concentrate on work or study. {No Wifi Connect & Easy To Use} The unit be used without WiFi distribution network when it is turned on. The maximum use range is about 20 meters. When the battery of the white noise machine is low, it will emit a "beep beep" alarm sound to prompt you to charge the device in time.