Sleep is an essential part of human life, and its importance is as stated in a report by the World Health Organization, "sleep, like air, food, and water, is the basic necessities of human life.Product features:1) Switch the machine2) Volume adjustment3) Built-in 5 white noise songs to choose freely4) For the built-in commercial source 3-speed timing (30-60-9oMn), play music on the wall5) Button to adjust the volume level6) Scenario night light7) F card can be inserted to play music from memory card8) Support adapter power supply, without SD card9) Built-in lithium battery, 1800mAh/3.7vProduct parameters:Product Name: Microwave Light Music Sleep AidColor: WhiteMaterial: ABS plastic + food grade siliconeSize: 109*105*50mmNumber of sound sources 5Battery capacity: 1800mAhSpeaker: 4Ω3WAccessories: 1.2mUSB cablePower Mode.: AdapterProduct net weight: 400gSpecial Note:1; The sound of Sxdthy's white noise sleep instrument is like the sound of nature. It may take some time to get used to it. You can adjust the appropriate audio frequency. The adaptation time varies from person to person, about 2-5 days.2. Placing the white noise device away from the sleeper can effectively fill the room with white noise. If the noisy sound is coming from a certain direction, then you can place the noiser between you and the source of the noise.3; This "noise device" uses physical therapy (sound therapy) to promote sleep by improving the sound of the sleeping environment, which has a good effect of relieving and improving the group with "difficulty falling asleep" and mild insomnia symptoms, and can also help users improve Work and study attention. But this product is not a substitute for medical treatment!Use Note:1. Keep away from water and fire sources and high temperature environments, and avoid the machine being e