This wireless trigger is control discreteness for camera to trigger hot shoe flashgun synchronously. It's made up of two parts named signal transmitter and receiver. Receiver power type: Battery. The signal transmitter makes use of advanced circuit design and comport. It can transmit wireless signal that is being encoded. It has super low power consumption, no any damage to camera. The receiver work with AAAx2 batteries power supply, and decode with microprocessor.
Very low voltage working make sure that high level of safety and no damage to camera. 

Specification:

High-speed and synchronous for 1/200 second
Max. working distance: 30M (open area, without interference) 
Transmitter:60mm x 42mm x 30mm
Receiver:85mm x 54mm x 26mm

Receiver(PT-04TM)with PC Sync socket

The receiver has a mounting bracket that will fit into a traditional flash stand, with a ¼-20 threaded hole for mounting on a light stand or tripod. An adjusting knob allows the receiver to tilt on the bracket, with detents at straight up and 45 degree forward and backward positions (It can be tightened in any position +/- 90 degrees from vertical). On the top of the receiver is a hotshoe for mounting a flash unit. On the front of the unit is a small on/off switch and a small LED light that illuminates briefly when fired. The back of the receiver snaps off to reveal the battery compartment and two dip switches for channel selection. It uses AAAx2 batteries, the type typically used in film cameras. The battery compartment of the receiver is not clearly marked for polarity, but there is a faint outline showing the positive tip of the battery on the circuit board.

Suitable For:

-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 Including:

1x Hot Shoe socket Transmitter
2x Receiver (PT-04TM)
2x PC Sync cord for camera (2.5mm to Male)
4x AAA Alkaline batteries