Features Accurate Testing: The alcohol tester adopts a semiconductor gas sensor to provide high accuracy detection, and accurately feedback the actual alcohol concentration on the LCD screen. Usage Steps: Press the power button to start the tester, preheat for 1‑10 seconds, and automatically enter the blowing detection countdown after completion, waiting for the test results to be displayed. Measurement Range: The breath analyzer is blowing type, equipped with 5 mouthpieces, convenient and practical. The alcohol concentration measurement range is 0‑0.20%BAC, which meets most requirements. Convenient to Use: This digital breath analyzer provides 4 measurement units, suitable for different scenarios. Featuring a portable size and lightweight design, it is convenient to use anytime, anywhere. Power Supply: This portable alcohol checker is powered by 3 AAA batteries (not included), which is and energy saving. It supports USB interface charging and provides power display. Specification: Item Type: Portable Alcohol Tester Material: ABS Battery Type: 3 x AAA Battery (not included) Operating Temperature Range: -5-45℃ Storage Temperature Range: -20-50℃ Detection Method: Semiconductor Gas Sensor Breath Alcohol Concentration Measurement Range: 0-0.20%BAC Measurement Object: Breath Alcohol Concentration Sensor Replacement: Not Support Measurement Display Unit: %BAC (USA), g/l (European), mg/lBrAC (Japan), mg/100ml (China) Size: Approx. 12 x 5.5 x 2cm / 4.7 x 2.2 x 0.8in How to Use: 1. Prepare 3pcs 1.5V AAA battery (not included) for the first time use. Remove the battery cover, install the battery, and then replace the cover. 2. Press the power button. 3. Preheat for 1‑10 seconds, the device will enter preheat countdown for 10 seconds, please wait for the preheating time. 4. After preheating is completed, it will automatically enter the breath test countdown for 6 seconds. Wait for the test result to display. 5. Set the display units: After completing steps 2, 3, 4, if the display result appears within 5 seconds, double click the button to switch to the next measurement display unit (e% BAC USA, g/l European, mg/lBrAC Japan, mg/100ml China). packing list: 1 x Portable Alcohol Tester 5 x Mouthpieces 1 x User Manual Package List 1 x Portable Alcohol Tester 5 x Mouthpieces 1 x User Manual