Review on 🚗 High-Speed 3-Port USB Car Charger, 12V/24V Input, QC3.0 Output 4.8V, Cigarette Lighter Voltage Meter, Compatible with iPhone, iPad, Samsung Galaxy, and USB Charging Devices - Silver by Ryan Lawson

This little 12/24V adapter with 2 USB ports is a great value. If you're like me, your car doesn't have a voltmeter, so the only way you'll know about a bad battery or alternator is when you see a warning light on the dash. then it will be too late. This handy device not only charges up to two devices, but also shows you how many amps the battery draws. And if nothing is being charged, it shows you how many volts your battery currently has. And thanks to the short plug, it doesn't stick out of the socket like many double or triple USB adapters. In fact, it only sticks out a quarter of an inch from my dash. (Your results may vary based on your car's interior.) No matter how well it fits, at $10 it's a steal for two USB ports, a voltmeter, and an ammeter, all wrapped up in a simple, sleek gloss black adapter with a handy little digital screen. Much more than you get with most of your standard 12/24V USB adapters.