Features: 1. Built in purification room to purify impurities and leave only alcohol: to avoid bacterial growth in the blowing tube, not in contact with blowing, more accurate detection, and healthier measurement. 2. Clear and easy to read high-definition color screen. 3. Detection indicator: Three color indicator light, clear at a glance. 4.Intoxication alarm voice reminder. 5. Rechargeable lithium battery with long-lasting battery life. Specification: Product Name: Portable Alcohol Tester Sensor: high-precision sensor Test range: 0.000-0.199% BAC Material: ABS Power interface: Type-c charging interface Charging input: DC 5V Size: L*W*H 100*28*17mm Battery capacity: 200mAh Working environment: 0-45?? Operation process: In order to obtain accurate test results. Test after drinking for 20 minutes. Preheating mode: Press the button for 1 second to turn on, backlight, and display Light-up at the same time, displaying all contents, and ;drop;one. The sound prompts them to tum on the machine and immediately enter the standby preparation mode. 10 second countdown from 10:00 to 00:00 Blowing mode: After a 10 second countdown in preheating mode, it will immediately enter the 10 second blowing mode, and the blowing port will be protected. Maintain a distance of 2-3 centimeters with moderate pressure. Evenly exhale for 3-5 seconds The results indicate that a 10 second test result is displayed on the display screen of the tester Auto close: After displaying the results for 10 seconds, it will automatically close. intelligent power saving Packaging includes: Alcohol tester* 1 Charging cable * 1