3-Stage Volume Limit ProtectionMidola 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 growing teens even adults. It's