Shell: 50% ABS+50% PP How it works: Improve sleep quality Battery capacity: 800mAh Charging time: 1h Working hours: 50h 1. There are as many as 90 kinds of sleep-related diseases, including insomnia and sleep disordered breathing. Severe and long-term sleep problems can cause severe hypoxia in the brain and blood, and increased blood viscosity, which can lead to high blood pressure, diabetes, obesity, coronary heart disease, angina pectoris and sudden death at night, as well as various mental and psychological problems. This sleep instrument has multiple modes to choose from, which can effectively solve the needs. 2. If the spectrogram of a sound looks like a straight line, or the intensity of each frequency component is equal, then it belongs to white noise. White noise can hide other sounds that affect our rest or work and study. , So that our brain can not detect these sounds. 3.9 kinds of natural sound effects, sound of running water, sound of rain, white noise, sound of waves, cricket sound, bird sound, lullaby (3 pieces). 4. Shield noise, improve concentration, and make learning more attentive. 5. Soothe the nerves and help sleep, reduce environmental interference, and improve sleep quality. 6. Intelligent timing, customize your playing time, automatically stop playing at the timing, not afraid of wasting excess power, three-speed timing, red light for 15 minutes, green light for 30 minutes, and blue light for 60 minutes. 7. Clear button distribution, simple operation, you can get started immediately.