About this item Bluetooth 5.4 HD Sound with ANC: Built-in microphone and Active Noise Cancelling gently block distractions to improve focus during online classes. Wireless Bluetooth (quick pairing) or wired (detachable AUX cable) dual connection. Stable within 15m, volume-limited in wired mode. 40mm high-fidelity speaker boosts voice clarity by 50%. 2-Stage Volume Limit + ANC: These headphones feature 85/94dB volume limits for hearing protection. Light Active Noise Cancelling helps kids concentrate without discomfort. One-button DB switch for different ages; 94dB requires parent supervision. Lightweight & Comfortable with ANC: Foldable design with soft earmuffs (3 sizes) and 4-level headband for ages 316. Gentle noise cancellation avoids pressure. Tangle-free wireless, comfortable for long wear. 68 Hours + Type-C Fast Charging: Up to 12 days of online classes (5hr/day) or 68hr music playback. Type-C charges fully in 2hr. Auto sleep mode saves power. ANC supports extended use.(ANC on ju