I am no expert in this field but I would think that this depends on the output of the router you are using and the enviroment the unit is being used in.
Mine is about 70 feet from the router but this is an old house with solid brick/stone walls, there are 3 walls between router and TP link and mine works perfectly. It is being used to steam live and on demand tv to a Youview box in our bedroom.
Apart from setting up problems and confusing instructions I find that it does what it says it will do.
Hope this is helpful
I was in a large bricked apartment and had range by the pool about 20 metres away..
answered on 18 Nov 2013
I have only used this over a distance of about 3 metres within one room, so I don't know what the maximum range might be, but from experience of other similar devices the range will be very dependant on the materials between devices, for example the number of and material used in the construction of walls, doors, floors and ceilings.
answered on 16 Nov 2013
Well I didn't measure it but it's enough to have no problems in my house: (45 sqm ground floor + 45 sqm on 1st floor)
answered on 17 Nov 2013
Around 30 meters but cannot recommend this product in any way
answered on 15 Nov 2013