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Question: I what to make sure this is the N1 series and not the N3 that is pictured,
Document: Using standard AAA batteries that you can get anywhereFYIThe N1, N2, N3 are all the same, it's only about the cable to remote trigger the camera. To trigger a flash you do not need the cable
These are my second set of Yongnuo RF-603. First one I bought was with the N3 cable and the items worked perfectly. I would say they are highly reliable. I needed the set with the N1 cable so I can take long exposure shots with my D800. Although it is not advertised as compatible with the D800 it does work. Just like the first set I got the transceivers fit snugly on the hotshoe unlike the set my friend got for his Canon 5DMKII.
I ordered the N1 version of this transceiver set on two separate occasions. Both times they sent me the N3 version which has the wrong shutter release cable for a D200. The transceivers work great, but I need a shutter release cable that works with the D200. The cable that came with the N3 version works with a D7000 but not the D200.UPDATE 2/4/2012 - I'm bumping the rating up from 3 to 5. I sent the N3 version back and ordered another N1 version.
So for the price they are dependable and I never had a misfire of the flashes. And I'm glad it got me back to using manual settings. I haven't tried one as a shutter release yet. Make sure you check the numbers and letters so you get the correct shutter release cable for your camera.
I bought these to trigger my Nikon SB600 off camera. I have the D700, and this trigger works very well with this camera. This trigger can trigger the SB600 but cannot wake it up from sleep mode. So if you have the Nikon SB600, you need to make sure to turn the sleep mode off or keep the flash from going into sleep mode.
When that setup is employed, I can mount the camera on a tripod and use one of the triggers to remotely focus and fire the camera. That's pretty sweet: no need for a separate remote shutter release.Be aware that there are two versions of this item. One is for Nikon, the other for Canon. Make sure you get the right one.
I got this a month ago and love it. It works exactly as it should. I'm ordering 2 more sets now, in fact, to finish up my flash set up. Just make sure you read the description carefully as the triggers are camera specific (Nikon and Canon use different triggers).I'm using this on a Nikon D700 with the SB700 and it works perfectly. Would definitely recommend this!
Very easy to use, caused miss fire due to not able to secure it on. also the on/off button is in a weird spot, you have to take the flash off in order to turn on/off button. other wise works as described. just have to make sure it's in tied every time you move around with your camera. I may return it and get me something else that I don't have to worry about everytime I move if the flash is falling off or miss firing.
I will soon get another set so I have an extra N1 cable just incase.
The Yongnuo RF-603 N1 has great distance range. I was shoot flash and images from close to 150 feet way.
Answer: The difference between the N1 and the N3 is the shutter cable.  The cable is not pictured here.  Check the compatibility with your camera to be sure you get the proper, i.e., N1 or N3 cable.