Ok I have had this for over a week. My biggest problem is this usb passthru. I just cant leave it alone. I have a usb port on my car stereo and I got the car adapter usb port that Steve gave me ( thanks so much Steve). I get so much vapor from the passthrew that I dont like to use the auto battery now. I know if I get a manual battery I will get better vapor then an auto but my question is will it be less, better or the same as the passthrew? l