This Bolt BO-CZ2 Locking Flash Power Cable allows you to connect compatible battery packs to select Canon flash units. It features a twist-lock mechanism between the battery pack and the cable to ensure a secure connection and a weather seal between the flash and the cable. This locking mechanism works with both Cyclone DR PP-400DR and Quantum Turbo 3 battery packs, however the cable will also work with packs that do not feature this mechanism. Additionally, it has a coiled length of 28 and can stretch to 110. Battery Pack Compatibility Impact LiteTrek battery packs Bolt Cyclone battery packs Quantum Turbo battery packs Lumedyne battery packs Dynalite battery packs Flash Compatibility Canon: 430EZ, 480G, 540EZ, 550EX, 580EX, 580EX II, and 600EX-RT Nissin: MG8000, Di866,Di866 Mark II & Di700 for Canon cameras Bolt: VX710 and VX-760 for Canon or Nikon cameras Limited