ROCKY CREEK PA012 DUALPORT USB PWR ADAPT&VLTMETER W/MRT PLUG
$72.90
This adapter will fit any 12V merit power socket. The two USB power
ports offer 5V/2.1 Amp per socket. When the adapter is plugged in and
powered, it will display the voltage of your battery. The USB charging
ports will supply enough power to charge a phone, tablet and GPS.