Active noise reduction headphones will have a noise reduction switch, such as my own shell prince-silent headphones. I can switch the noise reduction mode by touching my left ear twice, and there will be voice prompts. Moreover, I personally feel that the noise reduction effect of headphones is obvious under actual use. After turning on the noise reduction in a noisy environment, I can clearly hear the singing, and the surrounding noise is isolated. In addition, the delay is very low, no matter watching TV or playing games, you can hardly feel the delay. Compared with other headphones, the effect is remarkable and the sound quality of the headphones is good.