I should have ordered the Wagan first. Works great. I learned about this the hard way. Purchased a cheap look-a-like previously that didn't work in any of four 12v power outlets in my semi. Would cost more to send back for replacement then it was worth. My only kudos is the double-sided sticky pad included isn't very sticky. Ended up discarding it after it failed several times to hold on the side of my dashboard. Had to use some double-sided tape I already had.