The Outdoor Tech wired audio speakers where a great addition to my K2 helmet, which came factory with small Thin sounding speaker and the cord cut out immediately out of the box. The Outdoor Tech speakers fit right in the factory helmets speaker pocket and the supplied cord is plenty long to route through the helmet.
Speakers aren't perfect, especially for the guy used to listening to $500 set of in ears, but are way better than no tunes at all.
Bass is ok, the closer you can get them to your head the better.
The exterior buttons on the ear piece are awesome! Used them skiing and was able to push to pause the audio with a gloved hand.
They are really well priced and a good upgrade.
I recommend them.