Quantum Flash Locking Module for Quantum Trio, Pilot, and Copilot systems (MB2) Cord locks into output jack of Quantum Battery Long coiled cord stretches from 2 from to 6-Feet for use with belt clipped or shoulder strapped battery Module locks into flash's battery compartment Quantum QB1+ or QB1C and Canon 430EX/430EX II/580EX II/600EX-RT/Minolta 4000AF/Nikon SB7E/Promatic FTD3500AF/Quantaray QTB5000AF/Simon TST224/TST324/ Starblitz 3000 Series/D30CP