Avantree Roadtirp comes equipped with a motion sensor that will automatically power the car kit on when it detects motion and off after no motion is detected for a period of time.
Using the "Auto-Power On" function:
If you would like to use the motion sensor activated powering system of the Roadtrip, simply turn the car kit on by flipping the power switch into the "ON" or "FM" position.
Now, when you get into the car, the Roadtrip should automatically power on and reconnect to your phone. You will hear "Power on" and "Connected".
DO NOT TURN THE ROADTRIP OFF. Turning the Roadtrip off will DEACTIVATE the motion sensor.