Overview: The remote trigger for studio flashes & outdoor flash is used as the controller of synchronous trigger studio flash of cameras. It consists of a signal sender & a receiver trigger. It works by means of the frequency modulation wireless remote control. The signal transmitter adopts the advanced circuit & components, & can transmit the coded FM wireless signal. The circuit of the transmitter has the function of standby & hibernation, thus it has low power consumption. The products can work under the standby mode for more than one year with only one battery, & continuously trigger for thirty thousand times. The trigger current is only 0.01MA, which will definitely cause no damage to the flash contact of the camera. The transmitter is applicable to the traditional or digital camera with hot shoe or PC controlling interface. Receiver trigger adopts dry battery for power supply, which is safe, energy-saving, & convenient. The product adopts micro-computer for controlling the decoding, which has superior anti-interference capability; sensitive reaction speed, the highest synchronous speed can reach 1/500 sec. How to use: Make sure the channel selector of both transmitter & receiver are at the same position Insert the receiver's trigger output plug into your flash's jack Press the test button on your transmitter. The studio light 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 & insert into the socket) You should now be ready to start shooting Package Included:4 Channel Transmitter x 1AC-04A Receiver x 123A Battery (Transmitter inside) x 1 Sync Cord for Camera (2.5mm to Male) x 16.35mm JACK to 3.5mm Plug PC Sync Adapter x 1 English Instruction Manual x 1 Specification: Weight Approx:167g Size Approx:7 x 5.5 x 3