Quantum Flash Locking Module (MKZ3) 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 540EZ, 550EX, Contax TLA360, Metz 54MZ-3, 54MZ-4, 54MZ-4i, 58AF-1C, 58AF-1N, 58AF-1OP, 58AF-1PS, 58AF-2, Minolta 3600HS(D), 5600HS(D), Nikon SB28 (EURO), SB28 (NON-EURO), SB28D, SB28DX, SB29, SB800, SB80DX, Olympus FL-50