Thanks Dewster, how does the LED trigger work?
The infrared trigger works off of one of your receiver channels. It's a wire with an infrared LED that plugs it into a free channel. Program your transmitter and attach the LED to the infrared sensor on your camera. I bought the Sony Nex 5n because of it's weight, quality of photos/features and the fact that it could be remote triggered by infrared.
You'll have to match the GentLED with the camera you have or intend to buy. Check out this site:
http://www.gentles.ltd.uk/gentled/index.htm