You most likely won't like this answer but I'm gonna tell you anways. DO NOT buy the Circuitwriter. I made that mistake and I swear I will never make it again. I tried the first connects, they simply wouldn't take. Even looking at them under a micro, they looked fine, but the chip WOULD NOT OC. So I tried again, same results. Cleaned with "Goo gone" and Isoprohol Alocohol and a lint free satin cloth, reapplied the CircuitWriter 3 more times, and it still didn't work. So I went to my local electronic store here in Tucson and picked up a CircuitWorks pen. It worked GREAT. As for the defogger, I couldn't help with that one...