This has 30 non looping soothing sounds built-in.The intelligent memory function will automatically record your previous usage status. Portable design is easy to carry and useful for a of scenarios such as sleeping, relaxing, studying, working, and traveling. You don't have to worry about power consumption at all, the machine uses low-power consumption design with a large-capacity battery built-in. Improved sleep: White noise masking is called Masking Effect, which masking other ambient sounds makes it difficult to hear surrounding noises. White noise can block out snoring, barking, door closing, horns honking, traffic outside the window, and so on. As a result, people with insomnia or trouble falling asleep often listen to white noise to fall asleep faster and reduce interruptions. White noise can easier to fall back asleep again even after being woken. Privacy protection: White noise can protect privacy, particularly for employees working with sensitive information or public areas. Increase focus: White noise can help to stay concentrated and reduce distractions, especially in work environments that require high levels of concentration. Improve concentration ratio: White noise can help filter out ambient noise, making it easier to focus on your breathing and yoga movements, and improving concentration. Soothe babies: White noise works well for babies who have sleeping problems, making it easier for them to fall asleep and stay in a good sleep state. Colour:White Material:Plastic Package Contents: 1 * 1 * USB Cable 1 * English manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.