Can be Connected to Filter--Standard buckle type 52mm filter adapter ring, external filter can be connected when needed. You can mount 52mm ND or CPL Filters.------ Lens Protective Cover Design-Snap-in protective cover, more convenient to storage.-------- Rechargeable Battery Cover Design--Reserve a charging port that not only can replace the battery at any time but also can charge Hero 9/10/11/12 or connect an external microphone. Note: The original battery cover needs to be taken out before use.----------- Microphone Booster Pad--With this cage, the Mic will not show up in the image when shooting.----------- Storage Compartment Design--With this microphone adapter storage compartment, your camera can be connected to an external microphone. -----Package Include: 1 x Plastic,Protective case ,1 x Ring, 1 x lanes cap, 1 x cold shoe, 1 x Quick Release Buckle Mount, 1 x Thumb screw.