①. Soothing Nature Sounds: There are 16 kinds of natural sounds, including white/pink noise, fan sound, rain, thunder, forest, cricket, waves, streams, heartbeats, etc. ②. Timer and memory function: Three timer options: 30 minutes, 60 minutes and repeat playback. The white noise machine will automatically turn off when the timer goes off, or it will work until it is turned off. When you turn on the white noise machine next time, it will retain the last sound and volume settings. ③. Sleep companion: The sound machine helps you relax, and can also help drown out the background noise of babies. Natural gentle sounds create a pleasant sleep atmosphere, allowing you to feel calm and fall asleep gently. ④. Portable and compact: The white noise machine is lightweight and small. Suitable for home, office, especially when traveling. When you are alone, the white noise machine is always with you anywhere and anytime.