I am presently, as a journalist, reviewing Zumo 396. Have been trying to get some answers from Garmin’s support but got no response. Hoping that an owner of 396 can help me to clarify this: The Zumo 396 has a special connector for connection of external voltage. And it MUST have external power if the screen is to give its full strength! Just running on the inbuilt battery shows a very light screen, impossible to see in even modest sunlight. There is a USB socket for connection to computer and for charging but it cannot be used when 396 is in the mounting bracket, then the USB input is blocked. The power cable for the fixed mounting must be connected to 12 volt and then there is a voltage converter (lump) on the cable that reduces the voltage to 5 volts. The external voltage connection plug must be attached to the mount before the "RAM ball" plate is screwed on, and then it is stuck there. You cannot take the mount and cable to another bike, it must always be there. Not very safe to leave your bike parked with the Garmin Mount attached! So, Zumo owners, appreciate your advice, is the above correct or?