Great after-sales service : 12-month replacement warranty, 24-hour Customer-friendly Support Service. Foldable design(Easy in kids 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,Easy 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. Safety volume limit: (Two Mode: 85dB -Kids(Default) , 110dB -Aldult )This headphones protect your kids from hearing hurting (the level-85dB : the World Health Organization considers safer). The volume can be switched from 85dB to 110dB when you press and hold pause/play button 3 seconds. Fit for kids: For 2-16+ kids(Youngs) Durable materials that can hold rough playing by kids.The soft ear cushions perfectly on kids' ears and provide a comfortable listening experience.