AINOPE Car Charger Adapter, Dual QC3.0 Port 6A/36W Fast USB Car Charger All Metal Cigarette Lighter USB Charger Voltage Display Compatible with 11/11 pro/XR/X/XS/8, Galaxy Note 8/S9/S10+/S8-Black

Always used on my motorcycle to keep my iPhone at full charge. Has worked perfectly. Battery voltage pixel display is much easier than an analog gauge.

What I like: Build quality - Excellent. LED color - amber and not super bright: easy on your eyes at night They took the time to match the usb port colors with the LED amber color. Nice attention to detail! What I dont like: Voltage readout has super loose tolerance +/-0.15V I bought this mainly because I wanted an easy way to view the battery/alternator voltage. The charging speed wasnt a big importance for me, because 2A charge rate is pretty standard, I expected it would perform fine and didnt study it....(for the record I only charged one device at a time and noticed a 1.5A charge rate on the readout - again though, I was not focusing on charge rate). I tested the voltage read out against two multi-meters, both meters give identical results (the point being: my meters werent incorrect). (One of my meters is a Fluke.) I setup a test of two of these usb car adapters. One reads low, the other high. The reason Im testing two of them is because after getting the first one I noticed it was consistently low by about 0.15V. I bought a second to see if I just got a bad one. Nope, the second was high by about 0.1V. As an electrical engineer, Im blown away by how the voltage readout on these things can be that far off. It is a walk through the park to get an accurate reading, so somebodys young family member must have had the opportunity to do the design. The build quality is excellent. Funny though, I discovered a difference between the two that I ordered. One of the male prongs was nickel or chrome plated non-ferrous material and the other used a ferrous material. If the voltage readout was as well designed as the build quality, Id give this 5 stars.

We use this adapter on our sailboat to know where our battery charge is at while at anchor. It saves us turning on our inverter (which seems to use a fair amount of battery power). It also allows us to charge our electronic devices and see how much battery they use. My husband shows this to everyone we know that has a boat. Several have talked about getting one. Wont know until next summer whether they did or not. It is great to not have to worry about when to charge the boat batteries.

Awesome usb car charger, but Im giving it 4 stars as the voltage is 0.1 too low (I measured with two voltage meters). I wish its voltage was more accurate.

Works well can see voltage easy if car is charging and fast charge my phone

Works exactly as advertised and I tested the battery voltage gauge against a Fluke multimeter and it was almost exactly on.

Seem to charge good but when you plug your phone in to it the meter bounced between 14 and .5

Updated to junk now, as one of the two usbs is not working as well as the voltage quit working months ago. Charging via USB works great, the display to show battery/alternator ska display stopped working which I used for an older car. Now useless in the car

When a load is on it, it alternates between car voltage & amps drawn. Has fast charging. Is very cool!

Awesome charger , great charger excellent price