SOONSUN Side Open Protective Skeleton Housing Case with Skeleton Backdoor and Silicone Lens Cap for GoPro Hero 4, Hero 3+ and Hero 3 Camera Compatible with GoPro Hero4 Silver,Hero 4 Black,Hero3+,Hero 3 camera The side open skeleton housing has extra open space without blocking the audio alert and memory card slot.You could get full access not only to the Mini USB and Micro HDMI ports,but also memory card slot,insert/remove the memory card is possible without remove the housing case. Open side skeleton housing allow cables to be plugged into your camera for live-feed video,charging,cooling and enhanced audio at low speeds. Humanized design,storage card slot added,insert storage card directely without remove the housing case.For better recording function,recording hole is added on the top of the housing. The hollow design skeleton backdoor makes greater sound recording performance and better cooling function.