Only the Note to build a switch between the battery and USB socket missing.
The box draws in sleep mode 5-11mAh, although no cable / consumers are connected.
Is probably due to the voltage converter from 12V to 5V, which permanently transforms ...
So either use ignition plus, or hang NEN switch between them, so that the battery is not sucked empty in the state.
Otherwise, I would buy this box at any time.