Head circumference applicable: intercom headset is suitable for 20.5in~25.2in head circumference, removable microphone, can be installed left and right. This product cannot be used alone and needs to be used with PTT with user-friendly design: foldable hunting headphones retractable and adjustable headband, foldable earcup design. Suitable for both men and women. The ergonomic design fits the ear better. Analog textured handcuffs: Headphone earcups are made of acoustic cotton and ABS (additional anti-vibration fiber) material. Wearing comfortable and stress-free overtime Note: This version of the military headset only has a communication function and no noise cancellation. The battery compartment does not have any functions. Multi-purpose: Hunting headsets are suitable for extended events, military games, movie and TV props, group activities, role-playing and other outdoor ports.