Lifeguard Personal Breath Alcohol Tester There is no more accurate personal alcohol tester available than the LifeGuard. Wherever and whenever there is the need for personal breath alcohol content (BAC) measurement, LifeGuard is the one to trust. Lifeguard combines precision fuel cell technology, ease of use and reliability into a consumer breathalyzer that stands above all others in personal use and in testing those you care about. The LifeGuard comes complete with a permanent (fold-away) mouthpiece, 10 disposable (slip-on) mouthpieces, 9V battery, wrist strap, nylon carry pouch, hard carry case, operations manual, and one year warranty.