If you are fussy about it you can call it wireless - if you are easier call it radio. The thing will be the same in any case - control of your Olympus camera at a distance, with no cord in between.
If you are using an E-P3 or E-P4 or the OM-D you might need to shoot from a concealed position or away from the camera while it is on a tripod. Both the Hahnel Giga T Pro and the Hahnel Combi T will do this - they quote a range of 100 metres on the packaging. Attach the receiver to the hot shoe, plug the control cable from it to the side of the camera, and press the go button.
Why two different controllers? The blue box contains the one to use if you want the additional facility of firing a flash gun at a distance. You reverse the connection - transmitter on the camera and receiver under the flash and away you go.
The yellow packaging has the clever timer and interval controller in the trigger - but it doesn't do the flash thing. Use this one if you are going to do star trail photos or speeded up pictures of flowers blooming.
If you are going to insist on using the Nikon, Canon, or Pentax systems you can also get these products. But this posting is just for Olympus users and we won't mention that, okay?
