Feature:1. Bult-In Purification Chamber,Purify Impurities And Leave Only Alcohol: Avoid blowpipe breeding of bacteria , no contact with blowing , more accurate detection and healthier measuremen2. Clear And Easy To Read HD Color Screen3. Detection Indicator: 3-Color Indicator Light At A Glance4. Drunk Alert Voice Reminder5. Rechargeable Lithium Battery,Durable Battery Life Specification: Product Name Portable Alcohol Tester Sensor High precision sensor Model A20 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 PROCESSFor accurate test results . take the test 20 minutesafter drinking alcohol1 Warmup modePress the button for 1 second to turn on , backlight and display Light up at the same time , display all the content and “drop” one The sound prompts to turn on the machine , and immediately enters the waiting preparation mode . Start a 10 second countdown from 10 to 002 . Blow ModeAfter a 10-second countdown in warmup mode , it will immediately Enter the10-second blow mode and the blowport protects Hold a distance of 2-3cm , with moderate pressure.Exhale evenly for 3-5seconds3 . The results showFrom the tester's displayRead the test results for 10 seconds4 . Automatic shut-down10 seconds after the result is displayedit will automatically shut down.Smart power saving. Package Included:1 X Alcohol Tester