In a simple, plastic design, the Ulanzi G9-4 Plastic Cage allows you to expand your HERO9 with accessories such as lights, mics, and ND filters for vlogging, livestreaming, and most other applications. It features two shoe mounts on top and comes with a 52mm threaded filter adapter. On the bottom, it provides space for a mic adapter and has a 2-prong mount for attaching directly to various supports. The cage leaves access to the USB port of the camera for connecting your audio adapter as well as for charging the camera during use. A lens cover is also included for protecting the lens when not using the camera.