RE: Sunpoint, mini-optical-mouse
That really doesn't sound right. They would normally rate the current draw in ma not mw.
Oh, by the way most new R/C transmitters only put out 1/2 to 3/4 watt or 500-750mw and can transmit for a good 2500 feet.
There are many companies selling equipment both on Ebay and off that are falsely stating range. Many companies don't even know what they are selling or what exact frequency they are transmitting on.
The best thing to do would be to see if they are FCC approved, if not, buyer beware. I would say that 80% of all spy equipment, home security equipment for sale on the internet is Not FCC approved, including some US venders.
I would like to know how much bandwidth all of these transmitters are using. The next local ham meeting is coming up soon, time to hook up with some people with test equipment.
If you buy inexpensive equipment look for pll or crystal controlled circuits to avoid drift. The spyderlinker receiver with tuning knob will drift over time but probably not during a flight.