Descriptions: 1. USB interface charging, no need to purchase additional batteries. 2. The test does not require contact with the mouth, ensuring safe and hygienic use. 3. One-button operation, simple to use; test completes in 22 seconds. 4. LCD display for clear and easy reading. 5. Emits different beeping sounds based on alcohol level detected. 6. Features a highly sensitive semiconductor sensor for fast response and accurate results. Specifications: 1. Sensor: Highly sensitive direct-heated alcohol sensor 2. Test range: 0.0000.19% BAC (0.01.9 g/L) 3. Accuracy: 0.05% BAC 4. Voltage: 5V 5. Response time: Less than 5 seconds 6. Blow time: 35 seconds 7. Warm-up time: 10 seconds (wait 10 seconds after powering on before testing) 8. Auto power-off: 10 seconds after result is displayed 9. Operating environment: 0C to 45C 10. Power source: USB charging interface Package includes: 1 x Professional Alcohol Tester 1 x Charging Cable