Features:A digital alcohol Breath Analyzer, high sensitivity.Easy to carry, tiny volume with keychain design.Automatic shutdown, Rapid Response and Recovery.LCD display gives you clearer view and digital alcohol automatically gives you audible alert.Environment and healthful. Blowing design with five mouthpieces for multiple users.A simple method to analyze the concentration of Alcohol in the blood in any time and any place.Specifications:Battery: 2 * AAA Alkaline Batteries (Not Included)Sensor: Advanced semiconductor oxide alcohol sensorAccuracy: 0.01% BAC (0.1g / L)Range: 0.00-0.19%BAC and 0.0-1.9g / l (Or 0.00-0.95mg / l (BRAC)Package Weight: 51g/1.8ozPackage List:1 * Alcohol Breath Tester Analyzer (Batteries Not Included)5 * Mouthpieces1 * User Manual