1. Can be used to install for Hero 9 sport camera, protect the camera, expand accessories. 2. Dual cold boot port design, casual matching, unlocking more play. 3. Side holes reserved, no cover, easy to charge and change battery/memory card.Quick release cover for quick release. 4. Quick release cover for fast camera installation and removal, with rubber pads to prevent the camera from loosening. 5. With 1/4 screw holes, two cold shoe mounts can be installed to use the fill light microphone magic arm and other accessories. The bottom side is designed with for magnetic two-page interface, can be connected to the corresponding accessories, more leave 1/4 inch ale positioning holes, adaptable tripod / selfie stick / car bracket / headband / chest strap, etc. Color: Black Material: Aluminum Alloy Package Contents: 1 x Protective Shell 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.