Overview: Nice DC-04A4 channels FM (Transmitter Receiver) Set Wireless Flash Trigger for Studiothe transmitter of Nice brand can trigger all the reciever as long as it is Nice br&, eg. 4 Channel Transmitter can trigger the reciever from DC-01A, AC-01A, DC-02A, AC-02A, DC-04A, AC-04A, PT-04A, DC-16A, AC-16A;eg. 4 Channel Transmitter can trigger 16 Channel Receiver, but only work on 4 channels from the receiver (you have to find from the 16 Channel of the Receiver to see which 4 channels is work on). Introduction: The brand is called Nice. 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 & works by means of the frequency modulation wireless remote control. The signal transmitter adopts the advanced circuit & components, & can transmit the coded FM wireless signa. 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. Technique Parameter: Transmitter Receiver Power Source 12V 23A AAA x 2 Outdoor operating distance (open area) gt;30M Indoor operating distance gt;10M Frequency Channel 4 Operating Frequency 433 Mhz Outdoor Synchronous Speed (open area) Max 1/500sec Indoor Synchronous Speed Max 1/250sec How to use: Make sure the channel selector of both transmitter & 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 & insert into the socket) You should now be ready to start shooting Specification: Weight Approx:54g Size Approx:11.5 x 6.5 x 2.5