Introduction: The remote trigger for studio flashes and outdoor flash is used as the controller of synchronous trigger studio flash of cameras. It consists of a signal sender and a receiver trigger and works by means of the frequency modulation wireless remote control. Suitable For: Nikon SB-900, SB-800, SB-600, SB-28, SB-27, SB-26, SB-25, SB-24; Canon 580EX II, 580EX, 550EX, 540EZ, 520EZ, 430EX/EXII, 430EZ, 420EX, 420EZ, 380EX; Pentax AF-540 FGZ, AF-360 FGZ, AF-400 FT, AF-240 FT; Olympus FL-50, FL36; 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)How to use: Make sure the channel selector of both transmitter and receiver at same position Insert your flash hot shoe socket into the receiver"s hot shoe jack Press the test button on your transmitter. The Flash should now flash Insert the transmitter"s hot shoe socket into your camera"s hot shoe jack (if your camera does not have a hot shoe use a PC sync cord and insert into the socket) You should now be ready to start shootingpackage contents: 1 X 4 Channels Transmitter 2 X Receiver 1 X PC Sync cord for camera