I have the device now for 3 months and can only give 3 stars. it has a good battery life and is after I've practiced it quite quickly to the ear to I bkommen.wenn in my car seats and it is also use perfectly ok. When it but used at home and not permanently has the phone in his hand one has immediately disorders phone while. and if you are on foot on the road, it's not really better. then it works only when it tadelos hält.und in the hand that is not the meaning and purpose because I can make calls with the same phone.