Fotasy HEROHCU CNC Aluminum Skeleton Rugged Cage Protective Housing Case for GoPro Hero 4 (Blue) Aluminium alloy CNC injection molded Prevents GoPro Hero 4 camera crash caused by overheating Can mount UV lens, filter lens, polarizing lens of diameter 37 mm Can mount LCD screen / monitor the shooting through HDMI/USB interface connection Can mount on any GoPro Mount