[20 Soothing Sounds]: This portable baby sound machine has 20 kinds of sounds: 9 nature sounds, 5 light music, 5 white noise, 1 fetal sound, which can help drown out unwanted background noise and lull baby and adult into dreamland. So it's not just a sleep noise machine for babies, but an effective white noise machine for people who want to relax and unwind. [30, 60, 90 Minute Timer Function]: For safe, eco-friendly & effective use, the white noise machine can be played continuously or set with a 30, 60 or 90 minute timer, meaning the machine The noise maker will turn off and stop playing sounds automatically after the desired time, helping you relieve your stress and anxiety and promote a state of calm and relaxation. [Portable Design]: The top of the noise machine has a snap wristband sling, so you can take it anywhere and put it in the crib, car seat, stroller. On the other hand, the noise machine is lightweight (only 0.46 lbs) and small size: 7.6*5.8*3.0(cm), so you can also put it in your bag or phone. [1000 mAh Long-lasting Battery]: Built-in 1000 mAh battery, 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 about work or study. Long-lasting battery: Over 45 hours of continuous playback (up to 16 volume levels) and over 107 hours of continuous playback (8 volume levels) on a full charge. [No Wifi and Low Battery Alarm Function]: The machine can be used when turned on without Wifi distribution network. The maximum range of use is approximately 20 meters. When the white noise machine has low battery, it will emit a "Di Di" alarm sound, prompting you to recharge the equipment in time.