This kit starts up in less than 3 minutes (must be connected with the mobile). Once this is done, just leave it hanging in the sun visor and the recharge from time to time (it comes with a car charger, but to recharge while driving, you must remove it and place it nearby the cigarette lighter because the cable is too short. Alternatively, recharge at home using a USB charger). The supplied charger also charges his mobile if it has a USB port. Very convenient.
Besides the excellent battery life, this product boasts a remarkable audio quality and I have never had a problem to pass a call using voice recognition (tt mm must sometimes pronounce the names at how to a robot, but the machine systématiqument repeating the name of the called party, you will soon understand how to do it ...).
Note: there is no need to shout during calls. Rather, you should speak normally, as if the person was next to you. Against-intuitive when you phone in the car, but I think the camera has good qualities filters.
In short: no hésitatiion, this is a great product!