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This wireless trigger is control discreteness for camera to trigger hot shoe flashgun synchronously

Include signal transmitter and receiver
Easy installation, low power consumption

No any damage to camera
High-speed and synchronous for 1/2000 second
Max. working distance: 30M (open area, without interference)

Specification:
Transmitter: 60 x 42 x 30 mm
Receiver: 85 x 54 x 26 mm 
Power supply: 2 X AAA
Channel: 4

Transmitter:
It can be mounted on the hot shoe of camera or connected to the PC socket of camera with the cord supplied. Using the PC socket connection (if your camera has one) allows simultaneous use of a hot shoe-mounted flash unit and off-camera flashes with this radio trigger set. There's a test button on the top of the transmitter for test firing. The dip switches for channel selection are on the bottom. There is no power switch. The transmitter is powered by a small 12V alkaline battery. Remove the cover by a small #1 Phillips screwdriver before changing the battery.

Receiver (PT-04TM):

It has a mounting bracket which 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). There's a hot shoe for mounting a flash unit on the top of the receiver. And there's a small on/off switch and a small LED light on the front of the unit. The back of the receiver snaps off to reveal the battery compartment and two dip switches for channel selection. It is powered by 2 AAA batteries which are typically used in film cameras. The battery compartment is not clearly marked for polarity, but there's a faint outline showing the positive tip of the battery on the circuit board.

Compatible with:

Canon SpeedLite 580EX II, 580EX, 550EX, 540EZ, 520EZ, 430EX/EXII, 430EZ, 420EX, 420EZ, 380EX;

Nikon SpeedLight SB-900, 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).

NOTE: It is applicable to be used only that channel code switches for the transmitter and receiver are adjusted on the same condition.