Geree — usb power dc to dc converter 15 watts, 3 amps
This unit caused a fire, plastic case, no heat sink and the connectors used are only rated at 4.5 watts, .9 amps
Over $4000 in damage to my car!
They say they tested one unit for me and IT didn't fail. But, would not offer any independent lab testing.
Physics is Physics, you can't argue with the numbers.
The accepted no blame. And, being in China there is not much recourse one can take.