I took one of them apart and the wiring is all real nice quality. The battery pack isn't something generic so I am sure you would have to get a replacement from the website if it failed, I just plan on taking the batteries out when not in use to prevent corrosion. The sensitivity adjustment has a nice rang it seems. I've only tested it on my phone and desktop speakers so far and am planing on cranking up my stereo when I get home and seeing how it preforms!