USB Port with a Voltmeter
Purchased from EBay

Red Dual USB 12V Car Boat Socket Rocker Switch Panel with Voltage Voltmeter

I cut a small rectangular hole in the switch panel of my 2013 STS and installed this USB outlet/voltmeter. Wired into my switched auxiliary fuse block.
Easy to read Voltmeter to monitor the charging system/battery and it provides access to High Amp USB for charging my Sena and Iphone.
So far the meter has sustained several thousand miles of riding, heavy rains and vigorous washings. Works great.

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