Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Don't waste your money

This item is a real bust. First, you must wait for at least one-half hour after your last drink before it will 'work' (by which time you are probably driving already). But even then it is way off. I got readings 16 hours after my last of four drinks that were 0.18, and then one minute later 0.02, and one minute after that 0.08. It is unreliable.