The Redrock Micro 6-Pin Lemo to D-Tap Cable for powerPack is a 24" long cable that lets you power Redrock's powerPack by brick batteries with D-Tap ports. The cable's D-Tap end connects into a battery and the Lemo end into the powerPack. The powerPack is a power source that attaches to Redrock rigs specifically to power accessories (and/or a camera) on the rig. But powerPack must itself first get power from sources like brick batteries.