those are the ones we have that I was talking about, and they do a lot more than 100m at lower speeds, motorway or dual carriageway is a different matter, but we find that's because of the wind noise, not the distance We can talk with our sets way above the legal limit. We both have shark helmets we house the mic inside the anti misting attachment that comes with the helmets also as said l chopped off the leads to the helmet speakers and soldered on a 3.5 stereo jack plug so that we can use our inear headphone there a bit fiddly to get to get on but once fitted the sound cancelling kicks in the system works a treat, I've had phone calls on the motorway and the person at the other end had no idea l was riding the bike. http://www.amazon.co.uk/gp/product/B003 ... ge_o00_s00