The motion detection automatic shutdown works for me so well that I had the speakerphone since buying in the last 8 months Charging only 3 times (which I call also little while driving).
Unfortunately there is no way to learn about the controls, how full the battery is still. Most are the FSE when boarding loud that she would like to be loaded, the last time I have but I just wondered at some point that the thing has not blinked, because the battery was empty.
The integrated voice control is the way a little rustic, so you should consider whether you want to transfer the phonebook on the FSE and use the built-in speech recognition, which has the advantage that it says the caller's name when ringing, or whether you prefer uses the built-in voice control of the mobile phone.