In the house I use a USB wall adapter that puts out 5V 1500ma, and that works great with my PTs. In the car I use a USB adapter that puts out 5V and 1000ma, and it works just okay on all
three of my PTs. Not as good as the house adapter. I've Googled car USB adapters that output 5V 1500ma and found a few under $15. I may try one of them to improve the vapor output I get from the one I use in the car now. The regular battery charging USB car adapters usually put out only 500ma, which isn't sufficient to power a pass
through.