I tried to pull ~4 Amps and the Device shut off, so good protection. But it has Problems charging my LG G2, after about 20-30 mins, the Device gets very warm, Temps of 30°C are shown on display, and the voltage drops and my phone pulls less power. Also Current measurement isn't always correct, sometimes only shows 0,1A. But overall a good product, certainly better than the 4 chargers I had before. And very handy to check the voltage of the car battery.

When I got it, it did not work. Later that day it started to work. Is really only good for ~2 Ohms, or if you have a 5 Amp Usb Supply you could use it for 1 Ohm and below.

While it looks very flimsy, it holds the phone perfectly and the suction cup is really good. I do recommend this product and I use it for my LG G2 in my car, without problems so far.