Quick Response and Accurate Results:The alcohol tester adopts professional airway design and high precision semiconductor sensors. The number indicates the concentration result and beeps, and the blood concentration can be read accurately and quickly within 10 seconds. You get reliable and dependable results with accurate blood alcohol results. One Button Operation: The breath analyzer allows you to easily view the displayed results, with breath function of the non-contact mouth, just press the switch and wait 10 seconds to warm up to use, then use the mouth tester to use. 3-10 seconds, the result will show on the screen. Quick response and accurate results. Clear Screen Display:The professional breath analyzer has 3 measurement units to choose from, % BAC, BAC, mg/l. The digital tester sends an alarm when the value is higher than the standard value and is designed with a high-definition color screen for easy viewing of the measured value. Built-in 270mAh battery, USB charging, more convenient and fast. Compact and portable:The breath analyzer with keychain is compact and portable, it can easily fit in a handbag. hand or pocket, keychain or car. Ideal for blood alcohol testing for you and your family, providing you and your family with professional accuracy for safe driving. [Reminder] The portable breath alcohol tester has a purification box built-in, which can filter impurities and accurately detect alcohol content. Under normal circumstances, the alcohol concentration reaches its highest level after drinking for twenty minutes to half an hour. We recommend that you wait 20 minutes after drinking alcohol before taking the test. For the most accurate results, wait three minutes between each test.