Alcohol Detector Breath: Rapid detection of the presence of alcohol in exhaled air. Indicates the relative concentration of alcohol in blood. If alcohol is present in exhaled breath, reacts chemically with coated glass and produces a color change. This color change is proportional to the concentration of alcohol in the breath, which is an approximation of the relative concentration of blood alcohol (BAC). It is a screening test that provides a reliable and alert to help prevent drunk driving. * Accurate and reliable. * Easy to use. * Individually packaged. * Results in 2 minutes. IMPORTANT NOTE: Since transportation costs can exceed the value of some products, assess the possibility, if you plan to make more purchases in the near future to include them all in the same order. Your pocket will thank you.