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EASY TO USE - One button operation means you simply power on your keychain breathalyzer and begin testing in seconds. It's that easy! TAKE IT WITH YOU ANYWHERE - The ultra-compact breathalyzer keychain easily fits in a pocket or purse, making it a great portable breathalyzer for any occasion. OPTIMAL BREATH CAPTURE - The innovative fold-out mouthpiece ensures only your breath goes into the alcohol tester, while other airborne pollutants are kept out. Rapid detect results, quick response and resume. Portable and convenient to carry on keychain with audible alert Blue-colored backlight LCD display.