Descriptions: 1. USB interface charging, do not need to buy additional batteries. 2. The test does not need to touch the mouth, safe and hygienic. 3. One button operation, easy to use, the test can be completed in 22 seconds. 4. LCD display for easy reading. 5. According to the degree of alcohol exceeding the limit, different beeping sounds will be emitted. 6. Using highly sensitive semiconductor sensors, fast speed and accurate data. Specifications: 1: Sensor: Highly sensitive direct heat alcohol sensor 2: Test range: 0.000-0.19%BAC (0.0-1.9g/l) 3: Accuracy: ±0.05%BAC 4: Voltage 5V 5: The reaction time is less than 5S 6: Blowing time: 3-5 seconds 7: Preheating time: 10 seconds (wait for 10 seconds to test after starting) 8: Auto shutdown: 10 seconds after the result is displayed 9: Working environment: 0℃-45℃ 10: Power: USB charging interface Package includes: Professional Alcohol tester* 1 Charging cable * 1