whats the lead like? I've had a couple of adaptors like that, both with equally suspicious leads, one I swear had only 3 or 4 strand of "copper" in there, despite being printed as 0.75.
my adaptors, one came form a known hong kong company, the other came with my Tablet, form what I thought was a UK company (ie spelling, grammer in the ad was ok, uk seller on fleabay) the PSU had US pins on it, and came with an equally poor adaptor to RFs, the PSU got noticably hot during use, so binned it, and use one of my usb chargers for it.
my adaptors, one came form a known hong kong company, the other came with my Tablet, form what I thought was a UK company (ie spelling, grammer in the ad was ok, uk seller on fleabay) the PSU had US pins on it, and came with an equally poor adaptor to RFs, the PSU got noticably hot during use, so binned it, and use one of my usb chargers for it.