The device is characterized by simple handling. It is fastened with a rubber band supplied to the sun visor. First charge the internal battery, connect to the smartphone via Bluetooth, and even the address of the smartphone will be transferred to the hands-free system. Now I need press, which I am asked only the right button: "Who do you want to call?". I call the name as it appears in the address book, the device repeats the name and dials. Very good intelligibility of telephone partner. Pressing the left button I hang up. Works very well with Samsung Galaxy Ace 2, Cynus T1 and WIKO Stairway. You can also pair a second mobile phone via Bluetooth. The device says even if the battery is to be loaded. This is of course more often than in summer in winter (1x a week). Otherwise, it activates itself when you open the car door and walks independently after leaving the car to standby. For dual SIM phones it connects to the main card set in the mobile phone, that is, I can not choose which card I want to call. To make calls you must not touch the phone. When changing parameters (volume) or settings, the device speaks to me. It is so easy to use and highly recommended.