About this item 95 High Fidelity Soothing Sounds: This white noise machine has 95 built-in soothing sound settings available,inculding 5 white noise and 90 Lullaby ( lullaby, piano music, rain, sea, waves, insect, heartbeat, stream). Our sound machine helps you immerse yourself in a more relaxing environment. Auto Off Timer & Volume Control : Our sound machine possesses 2 level volume control & timer function, save your battery and sleep silently with 10, 30 mins auto-off timer. 5 White noise will play in order and skip to the next sound automatically, 2 mins per cycle, auto off after 10 mins. 90 Soothing sounds switch in 9 groups, 10 songs in each group. Press the big button will jump to the next set of music,without pressing the button,it will automatically shut off after 30 minutes. Adjustable Brightness: This noise machine features an optional night light which emits enough brightness for baby kids, it has four brightness, there are high light, medium light, dim and off, just long press the big button to adjust the brightness. Soft glow night light provides extra sense of safety and helps children feel secure and sleeping better. Portable & Compact: The portable sleep sound machine is powered by 3xAAA batteries and owns child-lock for safety, which can be used outside without connecting to a socket. With the size of 3.97*3.2*4.8 inch, it can be easily put in a handbag, backpack, suitcase or even a baby stroller, perfect for home, office or travel. You can take it go to wherever you want to go, without worrying about sleeplessness in unfamiliar environment anymore. It can powered by 3 AAA batteries (Included) that can be used outside without connecting to a socket, after batteries drain, please change it in time.