Item Type: HeadsetProduct Material: ABS (Shockproof Fiber Additive Type) + Sound Insulation Cotton + Stainless SteelBattery: 2 x AAA Battery (Useless)Suitable For Head Circumference: 20.5in~25.2inApplication: Expansion activities, military games, film and television props, group activities, role playing and other outdoor sports.Features1. Detachable microphone: freely adjustable left and right, very convenient.2. Simulated texture earmuffs: earmuffs made of acoustic cotton and ABS (additional anti vibration fiber) material. Wear very comfortable. Comfortable, long time will not have pressure.3. Retractable folding design: convenient storage, adapt to different head circumferencePackage List1 x Headset1 x Intercom Mark1 x Screwdriver2 x Screws1 x Instruction Manual1Suitable For Head Circumference: Intercom headset is suitable for 20.5in~25.2in head circumference, detachable microphone, can be installed left and right. This product can not be used alone, need to be used with PTT. 2Humanized Design: Foldable hunting headphones retractable adjustable headband, foldable earmuff design. Suitable for both men and women. Ergonomic design for better fit in the ear. 3Simulated Textured Earmuffs: Headset earmuffs are made of acoustic cotton and ABS (additional anti vibration fiber) material. Very comfortable to wear. Comfortable to wear and no pressure over time 4Note: This version of Military headset has only communication function, no noise cancellation function. The battery compartment does not have any function. 5Multi Purpose: Hunting headphone is suitable for expansion activities, military games, film and television props, group activities, role playing and other outdoor sports.