I bought this in order to be able to test powered things when I buy stuff on Facebook Marketplace. When I got it, I plugged it into the car port in the back of my tahoe and it worked from what I could tell, and was reaffirmed in my observations when I tested a powered subwoofer in the middle of a Best Buy parking lot. Was honestly vindicating as I had been scammed- well, bought something that didn't work and just trusting the guy- before, and I was happy to see the results of this purchase. Don't know the longevity though as I have honestly only used it once, and I keep it unplugged when I'm not using it because my car doesn't turn off the ports when its off and will drain its own battery.
Rating: [5 of 5 Stars!]