Product DescriptionBACtrack Go is the smallest, sleekest accurate breathalyzer on the market. Advanced MicroCheck alcohol sensor determines BAC quickly and accurately; mouthpiece folds away to protect it while not in use. Proprietary sensing technology and a specially tuned algorithm, deliver accurate results unparalleled at this price point.Product Features Accurate BAC Results - Proprietary Advanced MicroCheck Sensor technology delivers reliable, accurate BAC results you can trust Ultra-Compact Design - Fits inside a purse or pocket and can be easily used as a keychain Optimal Breath Capture - The innovative fold-out mouthpiece ensures only your breath goes into the breathalyzer, while other airborne pollutants are kept out. One Touch Operation - Simply power on your BACtrack Go and begin testing in seconds LCD Screen - BAC results are displayed on a bright blue, easy-to-read LCD display Free Shipping!