What are noise canceling headphones?

Noise-reducing earphone refers to a kind of earphone that uses some method to reduce noise. The methods of noise reduction include active noise reduction headphones and passive noise reduction. Active noise reduction is to generate reverse sound waves equal to external noise through the noise reduction system of Bluetooth headset, so as to achieve the effect of noise reduction. Passive noise reduction means that the earphone is designed to fit the human ear canal and worn in a closed way to reduce environmental noise. Such as airplanes, trains, subways, buses and other places where noise continues, the effect of using noise-reducing headphones will be more obvious. These headphones are mainly made for noisy environments. Nanka A2 Bluetooth headset, with active noise reduction function, 40dB noise reduction. The design of the headset adopts baby-grade silicone, and the in-ear design better isolates external noise.