Made of cheap and thin plastic. On/Off button is so loose that it rattles. Battery compartment door really difficult to open. It's so flimsy and ill-fitting that I almost broke it trying to open it for the first time. Tried noise cancelling effect on a turbo-prop plane, on a normal jet plane, and on the train. There is some minimal noise reduction but it comes at a price: The noise gets replaced by a powerful hissing that sounds as though you suddenly switch from your MP3 player to a radio with bad reception. I don't expect the stunning noise cancelling effect that my Bose QC3 has -- but still: Absoultely disappointing. Not worth the money at one thenth of the price. Would have given 0 starts if possible.