The Ulanzi Action Camera GoPro 9 Metal Cage is a metal case that allows you to enhance the video and audio of your GoPro Hero 9 Black for a more professional shot. It features a removable mount for a microphone or light as well as a removable mount for a filter. The microphone mount attaches to the bottom of the metal case and provides a slot for installing an optional GoPro 3.5mm microphone mount. It can be mounted on tripods, monopods, and other supports.