It only seems to work about 75% of the time... The display is always lit but usually if its gonna work, in about 5 mins of starting the engine, it goes dark then you turn on the power button and it works. You can play with the ignition and not start the car and it will work, but then actually start the car and it won't work...The dispaly will always be lit with the 2 Goose Eggs lit in the lower half if the antenna is down or in the upper if it is up..it may stay lit up like that the entire time

http://atlanta.craigslist.org/nat/cto/5025112770.html

Lmk if you have one! Im in the bay area and could trade some stuff

What doe it do, and do I need it? I'm doing my vacuum deletes.