Although ordinary earphones can help us isolate most of the noise in the environment, they usually target high-frequency noise with low sound penetration. In the bus, subway, or office, there are more low-frequency noises that we cannot avoid, such as the sound of bus engines and air conditioning.
These noises that are lurking around us will affect our work and life emotions in a subtle way, which will lead to a health crisis. The active noise reduction feature of the Toffee headphones played a role at this time. The so-called active noise reduction is based on passive noise reduction, and further filters out low-frequency noise in the environment to help users completely get rid of noise pollution.