This 10BP don’t have build-in motion sensor, so it can’t be auto powered on. You need to manually power on the car kit by press and hold MFB for 4 seconds. And once it is powered on, it will automatically reconnect to the last paired device.
When losing connection, the car kit will automatically switch itself off after 30 minutes for saving power. For next use, you need to turn it on again by press and hold MFB for 4 seconds.