The HS-G140 replaces the HS-G45U. Improvements include detachable speakers and thicker boom microphone.
These headsets are fantastic. I was unsure of buying after hearing about complaints of buzzing and static. We love them. If you adjust your intercom properly, any buzzing and static is gone. These headsets sound better than our J&M headsets in our full helmets. These headsets are just like putting on a pair of good music headphones, the music is clear with good bass response and the mic does not pick up any wind noise what so ever. If you're looking for a good, light, comfortable headset for your bike, you will not be disappointed with these.