1. Introduce high pure oxygen-free copper, RoHS tegmen effectively to reduce the loss. Single side incoming thread desiging, avoids rolling.
2. Rotary microphone can be fixed easily.
3. With managanese steel inside, good elasticity and intensity, PU material outside to make comfortable wearing.
4. 50mm speaker unit, using japan original imported materials, hifi sound quality, and refound natural voice.
5. Human engineering technology designed headband, rotary and foldable arm be carried freely.