1. Adopting a built-in sound control circuit, which has controlled the peak volume within 85 db.The decibels are at levels recommended by the United States, the European Union and many hearing health organizations, including the world health organization2. REACH standard of "registration, evaluation, authorization and restriction of chemicals" formulated by eu regulations has tested 169 chemicals in headphones;  3. High quality organic polymer material + imported inert memory sponge as ear muffs, better protect the development of children's auricle4. The use of flexible materials, can resist violence, can be bent at will, durable;              5. Imported microphone from South Korea can better recognize children's pronunciation and reduce distortion.6. With a built-in first to second line, it can be used by PC, mobile phone and tablet, so it can be better compatible with more devices;7. Each earphone comes with different DIY stickers and hand-painted graffiti stickers to highlight the unique personality of the earphone; Standard with 6 signature notes, help to better distinguish their own headphones, avoid confusion with the same type of headphones in the same class.