Extend the distance between your camera, tripod, or rail system and relay (USB battery pack) by up to 6.6' using the ONsite Relay DC Power Extension Cable from Tether Tools. This increased distance will allow photographers and filmmakers to swap batteries while minimizing the chance of camera or tripod shake. For photographers, this can be useful while shooting time-lapses, while videographers will benefit from added options for storing, mounting, and maneuvering.