Feature:1. Accurate Reading: Portable breathalyzer adopts advanced high accuracy technology sensor will immediately provide you with the most accurate value.2. LED Display: Digital breath alcohol tester features a high definition LED screen for intuitive display and easy observation at night.3. Small and Portable: Digital alcohol breathalyzer is easy to carry, save space for you, you can put it in your pocket or bag.4. Indicator Lights: Alcohol detector has 3 status lights. The green light indicates no drinking, the yellow light indicates drunk driving, and the red light indicates drunk driving.5. and Sanitary: Digital alcohol tester does not use traditional suction nozzles, it is and hygienic and can be used with confidence.How to Use:1. Power on: Press and hold the power on button for 1 second, after a beep, the tester's LED screen will start.2. Preheat: The "Preheat" character appears on the display and the number in the upper left corner starts counting down from 10 to 00.3. Blow test: After the "warm up" is completed, the tester enters the "blow" state and the blow character appears on the display, with the numbers counting down from 10 to 00. Blowing within this countdown time, the machine senses the gas, the buzzer "beep" prompted to stop blowing. 4. Display of results: The test results are read