White Noise Machine for Baby

10 Soothing Sounds Built-in 10 soothing sounds: white noise / lullaby 1 / cricket / sea waves / clock / birds / heartbeat / lullaby 2 / stream / lullaby 3.  Keeps little ones feeling safe and relaxed, so they can drift off to sleep slowly. Convenient Timer and Volume Adjustable Function You can set timer options between 15/30/60min to help conserve energy; adjustable volume design enables you to create a best sleeping environment for your baby. Automatic Noise Detection Mode If continuous noise is detected for 10 seconds, just turn on the music by yourself, the sleep machine will stop automatically after 15minutes of playing, and enter the detection mode again, looping all the time. Built-in Rechargeable Battery Built-in 300mAh battery that can be recharged by the included USB cable. 1 hour fast fully charged and lasts for 23 hours working time  No need to worry about power off problems. Compact and Portable Compact and lightweight; very convenient to carry around and suitable for tra