□ Automatic shut-off, timer and memory function: This white noise sleep aid can play continuously or use an optional timer with settings for 30, 60 or 90 minutes. □ 20 unique high-fidelity sound effects: Includes 20 soothing sound effects, such as white noise, pink noise, brown noise and relaxing nature sounds… □ Multiple light modes: The lampshade is detachable and comes with a white lampshade and a star-shaped lampshade. You can use them individually or in combination to achieve different lighting effects. □ Warm night light/starry sky projection: The optional night light function provides a soft, warm light; the color temperature is below 3300K and it is free from blue light. This soft light helps children fall asleep easily. □ Portable design, powered by AC/USB or 18650 batteries: This white noise machine has 3 power supply modes and comes with a convenient AC adapter.