I love this product. It has everything what I read on Amazaon website. I'm using it with my Razr V3xx cellphone and never heard any crackling sound during conversation. It is so weightless that I even forgot that something is hanging over my ear. I never see any problem even if I wear glasses. I have downloaded all my favorite music to my cellphone and listened them with Jabra500 headset. It has freed me from those annoying wires that all MP3 players and IPODs have.