Features: 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 2 receiver triggers and works by means of the frequency modulation wireless remote control.  The signal transmitter adopts the advanced circuit and components, and can transmit the coded FM wireless signa. The circuit of the transmitter has the function of standby and 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, and 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 1/250 sec.  All the models of the product uniquely have the multi-frequency isolation technique and the self coding matching function by users. Users can freely match and use the sender and the receiver according to the demands, which have 16 isolated channels to suit for specific shooting environments.  Triggers set in different channels can be combined to work or independently work but do not interfere with each other in an efficient distance.  Power of the signal transmitter: 23A 12V mini battery(included);  Power of the receiver(AC): 2 x 1.5V AAA Battery(not included);  Outdoor working distance: max. 30m / 90feet (open area, no fraise);  Indoor operating distance: max. 25m / 75feet;  Frequency: 433Mhz;  Synchronous speed: Max. 1/250sec;  Package size: approx. 6.6 x 6.6 x 4.5cm / 1.98 x 1.98 x 1.35in;  Package weight: 120g ; Synchronous Speed: Max 1/250sec;  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).  Package Included: 1 x 16-channel Transmitter(23A 12V battery included);  2 x 16-channel Receiver(AAA batteries NOT included);  1 x PC Sync Cord(2.5mm to PC);  1 x User Manual;