About this item Volume Protection - These children's headphones feature a three-stage safe volume limit of 74/85/94dB to protect hearing health. The 74dB mode is suitable for ages 3-6, 85dB is ideal for school-age children, and the 94dB requires parental supervision (press and hold for 2 seconds to switch). The combination key lock prevents accidental touches. Bluetooth 5.4 HD Sound Quality - Wireless Bluetooth + wired dual connection, specifically designed for children's use scenarios: Bluetooth 5.4 offers a stable connection for online classes and cartoons (uninterrupted connection within 15 meters), with plug-in mode still maintaining volume limits (special design). The 40mm high-fidelity speaker enhances voice clarity by 50% for online classes. Comfortable to Wear All Day - Folding headphones designed for children with comfortable earmuffs available in 3 sizes. The 4-speed retractable headband is suitable for head circumferences from ages 3-16, and the lightweight body ensures comf