I put the Sunforce 50012 inside my car's windscreen and plugged it into the cigar lighter. (On this car the cigar lighter is "live" even when the ignition is off). The Sunforce 50012 worked for one day. Next day it appeared dead (There is blue LED that blinks when it is working). I picked it up, it started working, sat it down, it quite. Twisted it, it worked, then it didn't, then it did. The old intermitant (sp) connection problem. Basically it was shot, dead, kaput, trash it. Long story short, I fixed it by taking it apart and re-soldering components. I am smart and lucky with nothing better to do. 99.999% of the users could not make this fix. So just forget about it. This thing is garbage.