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