Calming Natural Sounds: There are 30 kinds of natural sounds available including white noise, fan sound, rain, thunderstorm, forest, cricket, waves, streams, heartbeat , etc., to bring you hearing pleasure. 35 volume levels to choose from. 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 is off, or it will loop until it is turned off. The next time you turn on the white noise machine, it will keep the last sound and volume setting. Great Sleeping Companion: The sound machine helps drown out background noise, help babies relax. And it can also relieve the problem of adult insomnia. The natural soft sounds create a pleasant sleeping atmosphere, which makes you feel calm and fall asleep softly. Portable and Compact: The white noise machine is lightweight and small in size. Great for home, office, especially travel. When you are alone, let the white noise machine always stay with you anywhere and anytime.