Battery Operation Fixed Mode
In this mode, the unit does not switch to bus power even when it is connected to a USB port. This lets you use the unit even with an unpowered USB port on battery power.
1.On the VP-03, while holding down the  button, turn on the power. Then connect the USB cable.
The VP-03 will not enter this mode with a usb cable connected.
NOTE: Batteries are required.
This operation is required each time you turn on the power.