Alcohol Breath Tester is a great new novelty for wine and spirits lovers from Vinotemp. This portable keychain can easily be taken with you and within a matter of seconds provides a reading demonstrating the user's approximate blood alcohol content (BAC). Unit shows whether BAC falls into one of 3 categories: Green represents a BAC under .05% whereas Red represents a BAC above .08%. Breathalyzer unit should come fully-charged but is rechargeable through a standard USB cord (not included).