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 & 0.000-1.990‰BAC & 0.000-0.995 mg/l Sensor: Advanced semiconductor oxide alcohol sensor Warm up time: Within 10 seconds Response time: Within 5 seconds Operating temperature: 5°C ~ 40°C Power source: 2 * AAA batteries (Not included) Item size: 77 ×56 ×14mm Color: black Package Include: 1 x Digital Portable Alcohol Tester 5 x Mouth Piece Notes: 1. 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