Hello Cardo! I finally had a chance to test out the BK-1 Duo I won back around Valentines Day. WOW! I will admit I honestly had low expectations on the sound quality between 2 riders communicating over Bluetooth. MAN WAS I WRONG!! These ROCK!! We were out with a group of 12 Mountain Bikers. I had headset 1 and my girlfriend had headset 2. at first the volume seemed a little low until we got moving then the noise cancellation kicked in and i could hear her as if she were right next to me.
My wife and I only have about 10% of our eyesight (my wife worse than me). We love to ride trails. We recently did a fund raiser to raise money for the Canadian National Institute for the Blind. We biked 350km across Prince Edward Island (Canada) over 7 days and raised over $5,000. We would not have been able to do this easily without the Cardo BK-1. It was exactly what we needed. I used it to warning signals to my wife if there is an obstacle coming up. Thank you! http://www.eyebike4sight.ca/