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Improved Features:

1, Higher sync speed than the first generation

--- The highest flash sync speed up to 1/320 second (some of models may only reach
to 1/250s or less, difference combination of models of flash and camera using may
achieved difference flash sync speed).

2, Adding the Locking rings

3, Improved Flash / Shutter control Buttons

4, Working for more non Canon/Nikon cameras and single firing pin cameras 

--- ALL Standard Hot shoe DSLR Camera except Sny and Minolta.

Note: Canon cameras choose RF-603 II Canon version, Nikon Camera choose RF-603 II Nikon version, other cameras can choose any version.

5, Adding the power switch for single transmitter

--- Set the power switch on TX (single transmit) or TRX (transmit-receive automatic switch) state according to different shooting requirement. 

When it used as wireless triggering transmitter and flash testing, set to "TX"; 
When it used as wireless triggering receiver, using shutter release or other extended functions, set to "TRX".

set to OFF means turn off the power.

6, Suit for first generation, you can use them together.

Functions:

1, Remote Shutter Releas
a), Wireless Remote Shutter Release ( On camera )--- You can mount one receiver into the camera and connect it with the camera via the 2.5mm shutter connecting cable, and can the camera with other receiver. You can use it to fulfill the function of Auto-Focus, Continuous shooting, Long Exposure, Half-Way Pressing, Full-way Pressing and Bulb.

b), Remote Shutter Release ( off Camera )--- You can use the single receiver to fulfill the function of remote shutter release after you connect it with your camera via the 2.5mm cable

Note: This product can achieve wired /wireless remote shutter release function, need to LS-2.5 series shutter connecting cable(or purchase) according to the different cameras. When using the shutter release, the power switch need to set in”TRX” state.

2, Flash Trigger
a), To fire the Flash Speedlite --- one receiver can fire one flash speedlite, one set of RF-603 can control 2pcs Flash Speedlite at the same time.

b), To fire the Studio Strobe light --- You need to purchase an extra 6.35mm cable.

3, You can use ABOVE TWO FUNCTIONS simultaneousty

4, The RF-603 II Nikon version and Canon version can be used together