This product works very well at short range, ie across two floors. Bought because wireless internet very intermittent across three floors and was persuaded that this product could solve the problem- it didn't. Needs to be on SAME ring to be effective:- falls to pieces if signal path has to go via a sub dis. board (same house-4 storys). May be something to do with use of circuit breakers (the internal short-circuit protection solenoid/coil forming high impedance to data stream?). Distribution boards that use fuses (rewirable or cartridge) maybe doesn't affect data stream? Bottom line is that it didn't work for me. Ironic that product has same (limited)range as has the existing wireless system. Service and delivery superb.