1. Retractable and foldable design: The folding part is made of alloy stainless steel, which is , retractable, easy to store and adapt to different head circumferences (52-64cm). 2. texture earmuffs: skin-friendly material, no deformation, sweat-absorbent and breathable. 3. This product is a No noise reduction version earphones no need to pair with batteries.Communication must be used in conjunction with PTT. Suitable For Entry-Level Tactical Scenarios. Cleaning recommendations: The sponge ring of earmuff should be cleaned regularly (only of earphone can be cleaned, not soaked). Do not use solvents such as alcohol and acetone or products containing to clean earphone; do not clean sound insulation cotton inside earmuff. Model:HD-08 material. Light weight and durability. This is High quality of Soundproof Cotton + ABS material. Noise isolation effect: 60% Noise reduction method: physical noise reduction Wearing method: Head-mounted Removable microphone, can be installed on left or right Suitable for head circumference: 52cm-64cm Type:5th-Gen Tactical Headphones Application:Suitable for training, group activities, tactical games Colour:Black Material:Soundproof cotton + ABS Package Contents: 1 x Headphones Only above package content, other products are not included. Note: Light reflection and different displays may cause color of item in picture a little different from real thing. The measurement allowed error is +/- 1-3cm.