FYI I have bought Nomad products in the past, so when they announced their version of a wireless pad, I looked hard at it, then e-mailed them some questions. Their unit has hard wired short USB cables, so you cannot swap out longer ones. To get the full charge capability of their unit, you need to have both cables plugged in, so you lose the ability to plug in a USB jump drive. Yes, you get the battery pack for a boost, plus a pilot light. With the Jeda, I can swap longer cables, and fairly easily connect it to a full 2A 12V adapter in the 12V accessory port in the rear center console (see RPMTesla instructions). Thus I will get maximal charge current, and keep my front USB ports free for a USB drive and 'guest' charging cable. Full disclosure--I have a Jeda in hand, as well as 3 foot good quality mini-USB to USB cables, and am waiting for my 'full spec' P3D to arrive.
Why wouldn't you be able to use a usb extension cable?