[ High-Accuracy Alcohol Tester ] - This alcohol breathalyzer adopted a high-precision semiconductor alcohol sensor, can real-time response and resume, minimize the mistakes; with three kinds of unit conversion( % BAC/BAC/mg/L) [ Portable Designed Breathalyzer ] - Space-saving, lightweight, portable, easy to hold and carry, can put it on your bag or pocket, stay with your when driving; great for wedding, parties, or other activities, ensures your safe driving [ 5 Mouthpieces for Replace ] - Comes with 5 replaceable mouthpieces, maintain health and hygiene alcohol test; with one mouthpiece has been install to the breath inhaler, no worry to forget to carry it [ Easy to Use ] - Warm up for 15 seconds and blow into the breath inhaler for 3-5 seconds, then read the text result from the alcohol tester LCD screen; the result will display about 20 seconds and then will automatically switch off [ 30 Days Warranty ] - We are committed to provide you the premium service, no question asked refund or replacement service for our customer within 30 days, feel free to contact us Size:pack of 1 Description: With this digital breath alcohol tester, promptly and conveniently design for measuring BAC, a simple method to analyze blood alcohol concentration 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 15 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. The Caution symbol is displayed at: 0.020%BAC to 0.50%BAC; 0.200BAC to 0.500BAC; 0.100mg/L to 0.250mg/L. 7. The Danger symbol is displayed with a beep audible alert at: over or equal to 0.050%BAC or 0.500BAC or 0.250mg/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. Powered by 2pcs AAA alkaline battery(not include), replace the battery when the LCD screen flashes for low power. 6. Detection range: 0.000~0.199%BAC; 0.000~1.990BAC; 0.000~0.995mg/L