The Lone Star Aviation USB 2.4 Amp Power Converter Plug (LS03-05021) is the updated model of the LS03-05020. It's the same small size but with even more power for onboard charging of iPads, iPhone, iPods, cell phones and most things that use USB power to charge.
This model is recommended for iPad owners as it has enough power to charge during heavy use.
The Lone Star 2 amp USB cig plug will support 12 or 24 volts but Lone Star does recommend if you have an original cig plug to upgrade to their TSO'D cig plug 11-09432 or 11-11133.
The charger is a 2.4 amp built for 12 or 24 volt.