TrackIR - How far from sensor

I'm seriously considering buying the TrackIR 5 but was wondering how far you need to be from the sensor for it to work properly.
My monitor is currently recessed under a shelf which means I'll have to put the sensor on the shelf above it. This will put it about 2 feet (60 cm) away from my head.

Is this sufficient distance? :S
 
Probably unlimited. I have just tested it at 2-3m distance. However, it is not in-game testing, this was the maximum distance that I am able to test if the signal is detected.
 
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