1:1 real machine mold opening , perfect size for the camera body Rechargeable battery cover design, reserve a charging port ,not only can replace the battery at any time , but also can charge GoPro or connect an external microphone Can be connected to filter , standard type 52mm filter adapter ring,external filter can be connected when needed What's in the box: plastic cage*1, ND filter adapter*1, lens protector*1, top up base*1 Suitable for GoPro 9 and GoPro 10