Pretty good
Quick shipping, Works to enhance sound volume as described. As others have stated, mine came with the magnet polarized in the opposite direction. I had to just carefully pry out the magnet and turn it around. It works better now but the magnet itself is pretty weak.I decided to add a piece of double sided tape to hold it better. Seems to work ok.<br />All in all, makes sound louder as advertised and its a good price so I'm happy with it.
Rating: 4 stars