*Built-in noise reduction circuit inverting precision ANC, it can effectively cut off 85% of the background noise.
*dedicated high-quality noise-style 40mm diameter driver unit, to ensure the highest quality
*3.7v lithium ion battery,it was recharged without replacing batteries
*two modes of operation, to choose :noise reduction state (subject to a battery), the normal state (without battery) ,it was easy to switch
*earmuffs imported sponge, soft and comfortable, long wear without fatigue