Instruct: Classify Amazon reviews into positive or negative sentiment
Query: OK earbuds, but FAILS at noise cancellation

I bought these to replace an older pair of noise cancellation headphones, thinking it'd be nice to have something a bit more compact, but it fails at the one feature I wanted - noise cancellation. As far as I can tell, all it does is generate white noise, in a (bad) attempt to mask ambient sounds (e.g. fans running nearby, engine noise aboard an airplane).Save your money and buy something else if noise cancellation is one of the features you're looking for.Pros:- uses just 1 AAA battery- comes with a 3.5mm to airplane seat plug adapterCons:- The earbuds each have their own separate cable, making for a tangly mess - I resorted to using short pieces of twist tie to join them together for most of their length, like nearly all other earbuds are designed.- The noise cancellation doesn't work. Unlike other noise cancelling headsets I've owned, all this pair seems to do is generate white noise in an attempt to mask any ambient background noise. FAIL