[Active Noise Cancellation & Transparency Mode] The QC30 headphones' hybrid noise cancellation technology can cancel out more than 90% of noise, and the memory ear tips can completely cover the ears, significantly canceling out the low-to-mid noise of aviation, car engines, commuting, and other annoying background noises. Immerse yourself in live music and be unaffected by the noise. In the transparency mode, you can hear more outside sounds, and the earphones will automatically turn on the ANC mode when they are powered on by default, and you can short press the ANC button for 1 second to select (ANC off-> Transparency ->ANC ON) [ 60 hours of music enjoyment , fast charging ]: With a built-in 800mAh battery, you can enjoy 50 hours of noise cancellation in the world. Turn off the noise cancellation mode to extend to 60 hours, charge it for 4 hours on a 5-minute charge, fill the entire earbuds in 2.5H, or plug in a 3.5mm stereo audio cable to extend the battery life when t