Bought this specifically to eliminate hum, from a 10m long audio signal cable. Mostly worked, but still lots of hum left in the signal. The plug?, is an American 2 pin plug, with a flimsy, kinky, light breakable adapter, that they give you a wobbly, loose, easily fall out, UK adapter plug, to plug that into, yuck!. The whole plug thing once assembled is massive, takes up loads of space, is loose, wobbly, flimbsy, fragile, and falls off unplugging itself, very easily indeed. And it doesn’t eliminate the hum fully once set up. Spend a bit more money!, this one’s cheap, but pretty useless.