Finally a Bluetooth headset up to my expectations. The Sony mdr10 to a pure, clear and it is very beautiful and lightweight, making it comfortable to wear even for several hours. For me it is the rols bluetooth headset. Compared to parot zik or seneihzer550, there is no photo, I find the Sony ssurclasse rivals at prices significantly lower. Autonomy announced 17 seems to be more than correct. The quality of sound during conversations is also the appointment. In short this helmet is an orgasm for amateur ears bluetooth. I highly recommend it.