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Title: Useless, as in "Has no Function or Purpose"
Review: We purchased two of these for a Subaru and a Honda. Both were in "alert" mode as soon as plugged into the lighter socket, and would not function. Tried to diagnose, thinking there must be a problem with the cars. I was wrong: sensor circuit disables unit when any power is sent into the unit, as when connecting it to a car without a completely dead battery. What B & D failed to realize was that this is a "booster", and will encounter current from the accessory plug from time to time, especially when a car has a battery installed. Like, uh...99.8% of the time. Returned both units, bought real ones. Not Black and Decker.
