The 1 star rating is only because of the adapter. The headset itself is nice and slick and I would certainly recommend it. The adapter is a totally different story. To start with - it is too big. Along with my cellphone (Audiovox 8600) which is relatively small in of itself, it feels like having an apple in my pocket. Secondly - the buttons are too big. They get accidentally pressed, and it was not uncommon for the special unlocking sequence to be pressed and then hell breaks loose. Finally, although my specifc phone model can work with the Jabra A210 in automatic mode, this adapter does not know to go into standby after some period of inactivity and therefore drains the battery. The manufacturer's suggested to use in manual mode - but then what's the point... I had to return this.Cardo says a new version is due in June. If you have a non-BT phone, either wait for that or try the Jabra A210 adapter. I was able to pair the Cardo headset with the Jabra adapter.