Weewooday 2 Pieces 12v to 5v Dc Converter Buck Module USB Output Power Adapter Dc Car Power Converter Regulator

Worked great - added a bluetooth adapter to my older car stereo - the adapter has a USB plug. I didn't want to snake the USB cable to the cigarette lighter, this kept everything behind the dash. Clean install, power works fine, connection is tight. Handy little thing to have.

Easy hook up and works well simple and clean .

Works quite well. Tested at 12.3 volts input , it will actually deliver 3.0 amps at 4.93 volts which is better than I expected. (NOTE: One of my USB power meters turns out to not have a good connector, making my initial impression much worse.) I enclose some measured voltages with an adjustable USB load, from no load up to I=3.0 amps. It does not get very warm. Peak efficiency is 0.89 at 1 A, and it is still 0.82 at 3 A output. Quiescent draw (no output load) is 6 mA at 12.3 V input. I wish the MFR would publish this kind of data but I guess they figure no one cares.

We use it to keep an ipad charged and the hardwire to 12v makes for a cleaner installation instead of a cigarette lighter plug. If the ipad is used all day, the charge won't stay at 100% but it's possibly (probably) because the battery is getting old and not the adapters fault.

Using this in my car, which is not garage kept, for a VIOFO dashcam. Worked well for 2 years. The heat and vibration finally got to it, now it draws 0A and outputs nothing. Wish there was an automotive rated one on Amazon for a few dollars more... This one is still excellent for the price.

Good quality

I've purchased several of these for outdoor use. I had some cameras that were approved outdoor use, but their power supplies were not. I was able to find outdoor garden light power supplies that had a voltage that was a little too high. But those voltages were within the range for this product, making them a perfect solution!The electronics for this device are sealed in what I think to be epoxy. There's is no way that I can find for water to leak in. I connected these to the garden light kit, and to my camera and it worked like a charm. Afterwards, I got several more of these and they've been working reliably ever since then.

Its spec says it can output 5V/3A. When no load is connected, the output voltage is 5.11V. But once it is connected a cellphone charger which requires 5V/2A to charge, this unit's output drops to 3.88V, which is useless for my application.