Smallest backtrack breathalyzer ever made small enough to fit inside a purse or pocket and can be used as a keychain * Displays BAC results in easy-to-read 2 digit LED display: 0.02, 0.13, etc * Innovative folding mouthpiece - maximizes portability and ease of use; Three optional mouthpieces also included for multiple users * Wide test range - results displayed from 0.00 - 0.40 % BAC * FDA cleared for personal use