Features:Three kinds of alcohol measurement unit conversion (BAC / mg/l / BAC%)Digital alcohol tester with audible alert.LCD backlight display for easy reading.Quick response and resume.Specially design for safe driving.Easy and accurate detection.Small and portable, easy to carry around.Specifications:Detect range: 0.000-0.199% BAC & 0.000-1.990BAC & 0.000-0.995 mg/lSensor: Advanced semiconductor oxide alcohol sensorWarm up time: Within 10 secondsResponse time: Within 5 secondsOperating temperature: 5C ~ 40CPower source: 2 * AAA batteries (Not included)Item size: 77 56 14mmColor: blackPackage Include:1 x Digital Portable Alcohol Tester5 x Mouth PieceNotes1. Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the pictures.2. Due to different personal measurement technique , there may be 1-3mm error of the physical.Thank you! Return Policy All of our items come with a 30-day free return policy. If you need to return, please contact us, let us know the detailed problem and send us some pictures for confirmation. We reserve the right to refuse any returns for objective reasons. Shipping Policy All of our items are shipped free with tracking numbers. Orders will be shipped within 3 working days upon receipt of payment. Most orders will be shipped within 1 working day. In most cases, shipping takes 8-12 working days.