I have been contacted by the fine folks at vaprlife.com and wish to issue a retraction on their customer service. After a little snafu they contacted me and I ended up sending the unit back for repair which they carried out in fine fashion. not only did they repair the unit but also thru in a digital volt meter for my trouble. I will not hesitate to do business with them in the future but also highly recommend the "Joker" 5 volt adjustable unit they sell as well. The customer service was excellent during the time when they contacted me thru this site. A very big "Kudos to them for a job very well done! Thank you, Dave Harrison