The white noise machine can release relatively uniform natural soothing sounds, which can make our body and mind relax and get high-quality sleep.features 10 soothing sounds lullaby 1, cricket, sea waves, clock, birds, heartbeat, lullaby 2, stream, lullaby 3, which can keep little ones feel safe and relaxed, then drift off to sleep slowly. Convenient timer and volume adjustable function you can set timer options between 153060min 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 10s, just turn on the music by yourself, the sleep machine will stop automatically after 15min 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 charge and last 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 travel use comes with a lanyard, you can hang the sleep machine on baby buggy or other place to save space. Specifications material abs electronic components color white sizelxwxh 9.3 x 8 x 2.8cm battery type polymer battery battery capacity 300mah use time 23 hours charging time 1 hour power 1w package contents 1 x sleep machine 1 x usb cable 1 x christmas gift bagavailable until 31122023