USB cigarette lighter charging with voltmeter and battery status indicator

Hello. Overview of USB charging powered by the car cigarette lighter socket
In the car, I have a voltmeter working fromcigarette lighter. Useful thing, I got used to it like a watch on my hand, but to use it you also need a splitter, and these are extra wires. Moreover, the contacts in this tee are not of high quality due to poor fixation, this does not appear to other consumers, but the voltmeter immediately responds by showing a voltage lower than the real one, scaring the driver who thinks that the generator is covered. Therefore, I have long watched this charge. And now there was a case, I took it for a review instead of the proposed BT headset with the same name RAXFLY.
They send charging without a box, wrapped in a little cloth, in a soft envelope. In my opinion it is very reliable.
The case is plastic white top, black bottom. Parts of the body are monolithic, except for the front panel - it walks a bit. Well, he walks and walks, it's not a phone, you do not need to hold a charge in your hands.

The charging case is not intended for easy disassembly, so I will not do it.

The charging case and plug are connected by a hinge with a fastened metal screw, which is fixed in four positions, which allows you to reject charging by 45 degrees up and down.

In front are two USB connectors and a display about which if you do not turn it on, you won’t guess.

When turned on for a second, all segments of the display light up.

Without connected consumers, only voltage is shown on the screen. The color of the segments is not green, as the site, but blue. I personally do not care, but still this is a flaw.

If the battery voltage drops below 12 volts, charging starts to beep and the red LOW warning lights up. Device performance is maintained up to 7.2 V

Nests are not signed, but upon joiningload, depending on which jack it is connected to, the corresponding numbers light up. And not right away, the device thinks for a couple of seconds and if the current consumption suits it, it is charging, if the current consumption is too high, the charging does not turn on.

USB sockets are not equivalent. On the left is 2.4 A, on the right is 1 A. When connected to the right jack of a consumer with a current of more than 1.8 A - 2.0 A, it is de-energized. The left socket is capable of delivering a current of 3.4 A.

Now let's move on to testing. To do this, you will need the following items. Cigarette lighter socket, usbmeter, load.

I am assembling such an installation and starting to measure it.

And here are the results. They are pleasing.

Charging is capable of delivering a current of 3.4 A, as stated. Moreover, the voltage is the same, that in idle mode, that at 3.5 A
The only thing that upset me a bit was that the voltage of the voltmeter underestimated by 0.1 V. Although this is only an assumption - the multimeter is also not calibrated.

In this video you can see how the low battery alarm works. It works at a voltage of less than 12 volts. In addition, with a low charge, powered devices are turned off.

Options
Input: 12-24V
Output: 5V / 3.4A
Size: 51.4 * 30.3 * 117 mm
Weight 43 g
Certification: CE / FCC / ROHS
In the car, I plugged into the right jacka phone consuming 1.5 A, to the left socket a load of 3A, charging coped with this task. The battery was somewhat discharged and when the engine was idle, the voltage on it dipped from 12.2 V to 11.8 V, charging
The display fades when the sun is bright, but this rarely happens when the sun peeks into the cigarette lighter zone.
Compared to an old voltmeter.

In the afternoon, everything is seen well ...

My cigarette lighter is tilted, sothe indication is clearly visible from the driver's seat without rotating the hinge. The intensity of the glow can be called neutral. That is not annoyingly bright, but not dim. Charging has no effect on the radio.

Given the above, we can say the device met expectations. That's all.
Thanks for your attention