1. SOUND FIELD Stainless steel adjusting head beam Adjustable head beam Anti-pull/anti-violence Durable and not easily deformed 2. SOFTCloth mesh earmuffs The cloth does not peel off Durable-soft and breathable 3. MICROPHONE Hd microphone Rotate can be freelybent, the radio isaccurate, and the callisclear 4. SOUND FIELD 50mm acoustic speaker High audio resolution Wide frequency response range The sound field has many levels