42dB Deep Active Noise CancellingEquipped with Seendas professional active noise cancelling technology, delivering a total noise reduction depth of 42dB (27dB active + 15dB passive). Features one-touch "ANC" control and specifically blocks 25dB of noise during flights. When your kid is attending online classes or doing homework at home, it isolates TV sounds and outdoor commotion, significantly boosting concentration. During air travel, your child can hear clearly without turning up the volumeeffectively blocking noise and protecting their hearing, giving parents complete peace of mind. 3-Level Safe Volume + High-Quality SoundIt is equipped with Seenda audio refining technology, supporting three safe volume adjustment levels of 74/85/94dB, and is fitted with a 40mm large-sized audio driver unit. The three levels cover all scenarios including "low volume ear protection (74dB), daily use (85dB), and noisy environment (94dB)". The 40mm driver unit reproduces f