The application enable bluetooth while charger is connected to the phone.
It also hold screen (keep screen awake) when charger is connected.
When disconnecting charger it releases screen hold and let you choose to disable phone bluetooth so that phone calls wont be redirected to car speaker.
Although, bluetooth can be disabled and screen can go standby manualy.
Another feature is to choose an application that will start with bluetooth speaker connection (car home for example).
There are also manual fetures:
1. Hold screen - manual hold screen, for the case that
there is no charger.
2. Phone speaker - redirect incoming and outgoing calls to
phone speaker, for the case that there is no car speaker