Neewer Wireless Remote FM Radio Flash Speedlite Trigger w/ 2.5mm PC 2 Receiver
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 batterySuitable:* 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)