Advanced MicroCheck Sensor Technology - BACtrack's proprietary 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 Effective Breath Capture - The innovative fold-out mouthpiece ensures only your breath goes into the breathalyzer, while ambient air, fumes, and other airborne gases are kept out. One Touch Operation - Simply power on your BACtrack Keychain and BAC results are displayed on a bright, easy-to-read LCD display in seconds Manufactured by BACtrack - The #1 most-trusted brand of breathalyzers, with over 14 years of experience providing the most accurate, convenient and affordable breath alcohol testing devices on the market The BACtrack Keychain Breathalyzer is a revolutionary portable breathalyzer that takes size and portability to the next level. The BACtrack Keychain Breathalyzer is a fully functional breath alcohol tester with an internal alcohol sensor, folding breath tube, and even optional mouthpieces. You can quickly and easily estimate your BAC, Blood Alcohol Content, by blowing through the mouthpiece for 5 seconds. Never before has a breathalyzer had accurate alcohol sensing technology in a design this small and affordable. You can take the product everywhere and test yourself, friends, family, or anyone who is curious about their Blood Alcohol Content. The innovative folding mouthpiece pulls out during testing and slides back down during storage – it’s that easy! Everyone will want to test themselves whether you’re at a party, bar, restaurant, or anywhere else alcohol is consumed. Learn how drinking alcohol affects your Blood Alcohol Content and always make smart, informed decisions. And you can trust the BACtrack Keychain Breathalyzer because of BACtrack’s history and experience with personal and professional alcohol breathalyzers.