The battery lasts forever! I haven't gotten it bellow 80% in a week's use. And I ride every day with music in the background.The speakers are very loud, you'll very rarely need to crank it all the way if you're under 60mph, specially if your helmet isn't noisy. 60mph and up you crank it up a little bit more and you're good, again that depends on how noisy your helmet is.The microphone quality is great, the controls are easy to use, the included different color trims are great to match to your helmet's color scheme.I haven't tested the comms between different comm systems, but I did use conference call via my phone which I find is superior than most comm systems as it doesn't rely on proximity or any underlying companility issues between different comms. The experience was beautiful, we stayed connected through out whole ride.In summary, it provides the best quality, functionality and fits any helmet for a very generous price. Can't go wrong with this comms system.