[First-person perspective ] Easily record your life, this product allows you to without doing anything, very suitable for Vlog/POV and other videos Suitable for adventure activities such as roller skating, cycling, mountaineering, hiking, skiing, boating, etc. [Comfortable to wear + adjustable] Equipped with an adjustable buckle, the length and size can be adjusted freely to meet the body shape of most people The waist adopts buckle design, plug and play, safe and reliable, easy to wear. It fits the human body naturally, suitable for long-term wear, easy and comfortable Even if the down jacket is thicker in winter, it will not affect wearing. The buckle design at the waist allows quick plug-and-play, which is safe, reliable and easy to wear. [Note] When doing strenuous exercise, please do not use the mobile phone chest and headband fixing kit to mobile phone videos. It is not suitable for running and jumping! Colour:Black Material:plastic Package Contents: 1 x Strap 1 x Adapter 1 x Mobile phone clamp 1 x Screw 1 x J seat 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.