The BacPac Extension Cable allows you to connect a Battery BacPac or LCD Touch BacPac to your GoPro HERO at a distance of up to 3'. This means you can place the camera in a hard-to-reach spot and still change the battery, or remotely monitor and operate the camera with the LCD Touch BacPac. Please note that to be able to connect this cable to your GoPro HERO you will need to use The Frame or a Skeleton Backdoor - it is not suitable for waterproof applications.