The GoPro BacPac Backdoor Kit for HERO3 Housing enables the Underwater or Skeleton Housing for the HERO3 to fit a HERO3 action camera with an optional LCD Touch BacPac or Battery BacPac attached. The kit includes a Standard BacPac Backdoor, a Skeleton BacPac Backdoor, and a Touch BacPac Backdoor. Compatibility Specifically for the HERO3 Dive Housing model AHDEH-301 - if you use the Standard Housing model AHSRH-301 you will need the ASDRK-301 backdoor kit. Additionally, these will not support the HERO3+ if used in the AHDEH-301 Dive Housing