Portable breathalyzer is designed to help you drive safely after drinking in a business negotiation, family gathering, party, dating or more situations. It adopts sensitive semiconductor alcohol sensor which brings quick and accurate results. Better repeat testing for 2-3 times and DO NOT drive if it shows "Caution" or "Danger".Specifications:Color: BlackMaterial: ABSSensor: Semiconductor Alcohol SensorAccuracy: -0.01~0.02% BAC (0.05% BAC Alarm Value)Preheat Time: 10sBlow Time: within 10s (Better for 3-5s)Power Supply: 2 * AAA Battery (Not Included)Auto Shutdown: about 10sItem Size: Approx. 11 * 3 * 7cm / 4.33 * 1.18 * 2.76inItem Weight: Approx. 40g / 1.41ozPackage Size: Approx. 14.6 * 11 * 3.6cm / 5.75 * 4.33 * 1.42inPackage Weight: Approx. 80g / 2.82ozPackage List:1 * Breathalyzer with Mouthpiece4 * Replaceable Mouthpiece