About this item Volume Protection - These children's headphones feature a three-stage safe volume setting of 74/85/94dB, ensuring hearing health: 74dB mode is suitable for ages 3-6, 85dB is designed for school-age children, and 94dB requires parental supervision (press and hold for 2 seconds to switch); a combination key lock prevents accidental touch. Bluetooth 5.4 HD Sound Quality - Wireless Bluetooth + wired dual connection, tailored for children's usage: Bluetooth 5.4 provides a stable connection for online classes and cartoons (uninterrupted connection within 15 meters), while plug-in mode still maintains volume limit (special design). The 40mm high-fidelity speaker enhances online class voice clarity by 50%. Comfortable to Wear All Day - Folding headphones designed specifically for children: featuring comfortable earmuffs (available in 3 sizes); a 4-speed retractable headband (suitable for head circumferences of 3-16 years); and a lightweight body. 68 Hours + Long Battery Life -