3-Stage Volume Limit Protection：Midola Kid's headphones use 74/85/94dB 3-stage safe volume, one-click protection (press "DB” button to switch)for hearing health: 74dB mode (WHO infant recommendation) for 3-6 years old, 85dB meets school-age children, 94dB requires parental supervision. Bluetooth 5.4 Headphones(Built-in microphone): 68 hours playtime Bluetooth headphones(hands-free calling) /Aux-in.Your kids can listen anytime in both a wired and wireless capacity. The wireless design is handy for avoiding tangles, a favorite feature of the big-kid panelists. However, the cord is detachable, minimizing a toddler's risk of getting snagged, but the volume restriction of wired headphones is normal. Comfortable and Collapsible Design: The adjustable headband gives the headphones some impressive flexibility, so they can adapt to the shape of your head for a perfect fit.Soft ear cushions and long-wearing comfortable without stress, fit for kids even adults. It's your kid's great travel partner, let your little ones enjoy the journey without bothering you. Quickly Pairing with Most Device: Wireless bluetooth For iPhone for iPad/ Android Cellphones/ PC and Tablets ; (Wire Mode: Detachable AUX 3.5mm cord audio jack . Crystal stereo sound-40mm dividers, produce high-quality sound, create an amazing experience. Ideal Gift Choice for Kids(3-16+): Comes with cartoon free combination stickers and a parent operation guide. US customer service responds within 24 hours.