The sleep sound machine has auto-off timer, you can set it according to your sleep needs. In addition, the white noise machine has a memory function, which remembers your last light, sound and volume settings. PRODUCT ADVANTAGES: 1.Use it to soothe your crying baby and give him a good sleep. 2.Use it for your family without turning on the night light from a distance when they wake up at night. 3.Use it to relax yourself from work or life pressure. 4.Use it to provide more privacy for your office conversations. 5.Use it to create a comfortable learning and working environment for you. 6.Use it to create a peaceful environment for your yoga, travel, and nap. 7.Use it to add a different color to you and your family. PRODUCT SPECIFICATIONS: Power mode: USB Function: timing, music function How it works: Sound sleep aid Battery life: 6-8h (inclusive) Built-in battery capacity: 1000mAh-1200mAh (included) Whether built-in battery: built-in battery WHAT WILL YOU GET? 1X Sleep instrument 1X Color box 1X Charging cable 1X Instruction Manual[Safety Assurance] The white noise machine has passed many certifications, so there is no need to worry about any accidents with the product If you have any questions, you can contact me at any time, we will reply technical support within 24 hours!. [Lightweight and Portable] With the sleek compact size and built-in rechargeable battery. The design of the device is simple and intuitive, light and easy to carry, and the design of large enough buttons allows you to easily change the track, turn on off the night light, change the color of the ambient light. [Convenient Function] Featuring timer options,and non-stop auto-off timer options available, so you can sleep more soundly without the worry to manually turn off the machine The white noise machine record your last set, automatically restores your previous volume, sound and timer. [Adjustable Baby Night Light] The white noise machine has unique color night lights and adjustable brightness. (white, warm, colorful). Adjust the brightness to make it suitable for any environment. You can use these ambient lights to decorate your environment. [High-fidelity and Soothing Sounds] White noise machine has 5 different fan sounds, 5 kinds of noise, 5 lullabies, 15 relaxing natural sounds(thunderstorm, ocean, rain, birds, stream), and 5 fetal heart sounds. The white noise machine can effectively cover up destructive or startling sounds to protect your sleep quality.