The smallest, sleekest and most accurate breathalyzer that you will find on the market, the Backtrack Go Breathalyzer features the advanced MicroCheck Alcohol Sensor Technology to determine BAC quickly. The ultra-compact design lets you fit it inside your purse or pocket and can be easily used as a keychain. It has one-touch operation sot that you can begin testing in just seconds and the innovative fold-out mouthpiece ensures that only your breath goes into the breathalyzer while ambient air, fumes, and other airborne gases are kept out. The mouthpiece folds away to protect it while not in use. A bright blue LCD screen makes the results easy to read.