Quickly estimate your blood alcohol concentration with this small and contactless alcohol breathalyzer. No need to worry about forget to install a mouthpiece or hygiene issue, you can directly blow to the tester inhaler without a mouthpiece, more convenient and safe. Portable to carry it with you, testing your BAC at any time and anywhere. How to Use: 1. Press and hold the power button for 1 second, the alcohol tester LCD with turn on with one beep sound. 2. Warm-up mode countdown for 10 seconds. 3. Testing mode countdown from 10 to 00 after warm-up mode, blow at this period. 4. Blow into the breath inhaler for 3-5 seconds with normal power after a deep inhalation. 5. Read the test result from the alcohol tester LCD. 6. Test range: 0.00%-0.19% BAC 0.0-1.9 g/L Notes: 1. The first use of the tester or after a long time no use, press the power button and retry several times if possible. 2. Repeatedly 2 or 3 times to obtain more accurate results. 3. Do not smoke and eat for 20 minutes prior to testing. 4. The test result is for reference only. 5.Rechargeable with USB cable Package Contains 1*Box 1*Instruction 1*USB data cable 1*Alcohol Tester