1. Create a comfortable sleeping space: By making low-frequency melody, let your brain get rid of noisy sound and be relaxed. Therefore, you can enhance sleeping quality and improve insomnia.
(20 kinds of music choices - White noise, Brown noise, Pink noise, and Natural voice etc)
2. Provide dual power supply: Both USB devices and batteries can be used to charge the machine
(4 kinds of timing - 30minutes, 60 minutes, 90 minutes, and cycle); Time will automatically shut down when the time is up
3. Support headphone and speaker: Can play music by connecting the sound port which is 3.5mm and speaker