Because of its shape, this adapter / power strip slips into the car cup holder, thus incorporating relatively discreetly. The wire length is correct. 12V 2 + 2 USB is good, but apparently if the delivered power is sufficient to operate a device (eg GPS). It is sometimes a bit just to properly load a somewhat demanding smartphone battery.
The "battery" and "efficiency alternator" seem a little gadget and as my car is new I can not assess whether it works or not ...
