So this week I went to go purchase a wireless IR camera. I found a cheap one on EB and really didn't expect much. I purchased it for Live Investigations so that everyone could have a first person point of view as we were roaming.
The one I purchased was a no name 2.4Ghz unit with 6 IR LED's. The unit can work with a 9V battery, but I am not sure how long that will work. I would recommend re-wiring a 12-14V battery back from a portable drill or flashlight. Or using a 9V LIPO and LIFE pack from RC remotes.
Video quality is fairly good, IR quality is surprisingly good. Signal quality depends on how much interference there is and how many walls it has to go through. Also depends a great deal on the battery life.