Invion GPS-5V1 Manuel D'instructions page 52

The following buttons appear on the Bluetooth menu.
Use to turn the Bluetooth On or Off.
Tap to make the GPS device discoverable.
Tap to activate the Auto Answer function.
Tap to increase the speaker volume or to scroll up the call list.
Tap to decrease the speaker volume or to scroll down the call
list.
Tap to make or answer a call.
Tap to end or reject a call.
Tap to delete the entered number.
Tap to display the call list.
Tap to switch between the player and your mobile phone during
a call.
Tap to turn off the microphone.
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