1、[Accurate Alcohol Tester] This alcohol tester utilizes high precise semiconductor alcohol sensor to monitor your alcohol level, ensuring responsible and safe driving. 2、[Advanced Algorithm] Upgraded with the double filtering fast algorithm (DFFA), this tester features high precise chip and smart sensor that filters out impurities, leaving only alcohol for more accurate measurements. 3、[Clear LCD Display] The alcohol tester features HD LCD screen that clearly shows your alcohol status with three color lighting. Green light indicates not exceeding the limit, flashing yellow light indicates drunk driving, and flashing red light indicates intoxicated driving. 4、[Upgraded Voice Prompt] The drunk driving detector provides voice prompts to immediately inform you whether you are over the limit or about drunk driving. The voice prompt ensures a clear notification of the test results. 5、[Contactless Measurement] This alcohol tester allows for quick detection without the need for contacting the blowing tube, ensuring a more hygienic and convenient testing process.