Top after-sales service : 12-month replacement warranty, 24-hour Customer-friendly Support Service. Foldable design(Easy put in school bag): The adjustable headband can adapt to the shape of your head for a perfect fit. Take your headphones wherever you go, just fold them up. Wireless or wired mode:Easy control wireless bluetooth mode , or Wired Mode (power run out) with 3.5mm audio jack,Quickly pairing with the most Bluetooth devices device: for iPhone for iPad/ Android Cellphones/ PC and Tablets. Crystal stereo sound-40mm dividers, produce high-quality sound, create an amazing experience. Safety volume control:The headphones is set to 85db.max(Default),reducing the risk of permanent hearing damage.Volume can be switched from 85dB / 110dB when press and hold pause/play button 3 seconds. Fit for kids: For 3-16+ kids(Youngs) Durable materials,headphone are built to last and withstand the rough play of kids.The soft ear cushions perfectly on your ears and provide a comfortable listening experience.