About this item Volume Protection - These children's headphones use 74/85/94dB three-stage safe volume, providing one-click protection for hearing health: 74dB mode is suitable for 3-6 years old, 85dB meets school-age children, and 94dB requires parental supervision (press and hold for 2 seconds to switch); combination key lock to prevent accidental touch. Bluetooth 5.4 HD Sound Quality - Wireless Bluetooth + wired dual connection, focusing on children's use scenarios: Bluetooth 5.4 ensures a stable connection for online classes and cartoons (uninterrupted connection within 15 meters); plug-in mode still maintains volume limit (exclusive patent). 40mm high-fidelity speaker increases online class voice clarity by 50%. Comfortable to Wear All Day - Folding headphones designed for children: comfortable earmuffs (3 sizes available); 4-speed retractable headband (suitable for 3-16 years old head circumference); lightweight body. 68 Hours + Long Battery Life - One charge can be used for: 12