1. Promote The Balance Of , With A Custom-Made Battery Buckle. It Can Not Only Alleviate The Problem Of Glasses Pressing On The Face, But Also Skillfully Integrate The Glasses And Battery. 2. The Cap-Type Wrapping Structure Is Designed To Fit The Shape Of The Head And Conform To Ergonomics. 3. 360-Degree Adjustment Knob, Free To Adjust The Tightness Of The Head Circumference, Enjoy Convenience And Comfort. 4. The Thoughtful Design Of The Winding Card Slot Can Neatly Fix The Power Supply Wires On The Headgear, And Bid Farewell To Clutter. 5. Removable Nylon Sticker Memory Foam Back Pad, Soft And Breathable, Comfortable To Wear For A Long Time Without Slipping. Applicable object:for Model: Pro 4 Pro 5 Colour:Black Material:POM+Silicone Size:Length:1.5cm Package Contents: 1 Box * Nibs Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.