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Professional Digital Alcohol Detector LCD Display Alcohol Tester Portable Breathalyzer Detector for Safety Driving Feature: Pormptly and conveniently design for measuring BAC. A simple method to analysis Blood Alcohol Concentration at anytime and anywhere. It's easy to carry. Digital alcohol tester with audible alert. Range 0.00-0.19% BAC & 0.0-1.9 g/l. Quick response and resume. USe mouthpiece. Auto power off:1 minute approx Key chain. Use 2 x 1.5V AAA batteries (Not included). Operating time:warm up:10s response: