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Non-contact design, convenient and safe to use With red LED illuminating light 3-step alcohol test with colored LED indication: - Safe (green): under 0.02% BAC (0.10mg / l BRAC) - Caution (yellow): over 0.02% BAC (0.10mg / l BRAC) to 0.05% BAC (0.25mg / l BRAC) - Danger (red): over 0.05% BAC (0.25mg / l BRAC) Single key operation, extremely easy to use 10 seconds' short warm up time Quick response and resume With keychain, convenient to carry List Price: $ 7.99 Deal Price: $ 3.99 http://www.6deal.com/en/led-alcohol-breathalyzer-breathalizer-breath-tester.html