Relieve Fatigue White noise relieves travel fatigue, sound-assisted therapy, and is non-addictive. Wide range of applications, a variety of soothing sound sources to meet the needs of different groups of people. Easy to store and carry Small size, does not take up space, easy to store and carry. There is absolutely no need to worry about not sleeping well when traveling. It is suitable for helping you fall asleep through music, lights, etc., very convenient. Also suitable for babies, it can simulate the womb environment and help babies fall asleep. Improve sleep quality The pleasant sound will help you sleep soundly and help you sleep better. Create a healthy home environment that helps you relax, de-stress and simplify your life. Easy to use, fashionable and lightweight, easy to carry, does not take up space, simple and convenient operation, suitable for the whole family to use. manual 1. The product has a total of 5 buttons, a switch button (including play/pause function), sync button, light button, previous song (including mute function) and next song (including add sound function). 2. A total of 9 music to help sleep (white noise, ocean waves, crickets, rain, birds, water, lullaby 1, lullaby 2, lullaby 3) 3. The light key can work independently, or it can work without booting. 4. Press and hold for 0.5 seconds to power on, short press to power on, pause playback and listen to a music track, the music is continuously played in a loop. Press the up and down keys to switch, and long press to increase or decrease the volume. After booting, it will be played in memory, and any music will also be remembered. The next time it is turned on, it will automatically play the music that was turned off last time. 5. Press the light button to divide into 6 cycles, one cycle from 10 minutes to 0, countdown from 10 minutes, and the breathing rate gradually slows down from 10 minutes. Inhale when the light is on, exhale when the light is dark, and the breath is guided.This feature is automatically deactivated for 1 hour. If the stopwatch function is not turned on, it will be in the stopwatch time if the stopwatch function is turned on. 6. The timing is divided into 15 minutes (bright red LED), 30 minutes (bright green LED), 60 minutes (bright blue LED), short press the fourth time to change and close the timing. They are respectively indicated by LED indicators.