Compatible with: For Nikon SB-900, SB-800, SB-600, SB-28, SB-27, SB-26, SB-25, SB-24; For Canon 580EX II, 580EX, 550EX, 540EZ, 520EZ, 430EX/EXII, 430EZ, 420EX, 420EZ, 380EX; For Pentax AF-540 FGZ, AF-360 FGZ, AF-400 FT, AF-240 FT; For Olympus FL-50, FL36; For Sigma EF-500 DG Super, EF-500 DG ST, EF-430; For Sunpak Auto 2000DZ, 622 Pro, 433AF, 433D, 383, 355AFm 344D, 333D; For Vivitar 285HV (Older Vivitar 285/283 works only with PC sync); Other flash models with a trigger voltage of 12V or lower; Work with flash units using universal hot shoe like for Nikon, for Sigma, for Olympus, for Pentax (except for SONY as they use a special hot shoe)