Specifications: * Operate frequency: 433MHZ * Sync speed: 1/250s * Work range: <= 30M * Screw mount on receiver: 1/4" * Battery for tramsmitter: 23A-12V mini batter * Batery for receiver: AAA alkaline battery

Suitable: * Canon SpeedLite 580EX II, 580EX, 550EX, 540EZ, 520EZ, 430EX, 430EZ, 420EX,

Specifications: * Operate frequency: 433MHZ * Sync speed: 1/250s * Work range: <= 30M * Screw mount on receiver: 1/4" * Battery for tramsmitter: 23A-12V mini batter * Batery for receiver: AAA alkaline battery

Suitable: * Canon SpeedLite 580EX II, 580EX, 550EX, 540EZ, 520EZ, 430EX, 430EZ, 420EX, 420EZ, 380EX; * Nikon SpeedLight SB-800, SB-600, SB-28, SB-27, SB-26, SB-25, SB-24; * Olympus FL-50, FL36; * Pentax AF-540 FGZ, AF-360 FGZ, AF-400 FT, AF-240 FT; * Sigma EF-500 DG Super, EF-500 DG ST, EF-430; * Sunpak Auto 2000DZ, 622 Pro, 433AF, 433D, 383, 355AFm 344D, 333D; * 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 Nikon, Sigma, Olympus, Pentax (except Minolta SONY as they use a special hot shoe). Package contents: * 1x Transmitter (with built-in battery) * 2x Receiver * 1x PC Sync cord for camera (2.5mm to Male)