1. Professional airway design, advanced nano semiconductor alcohol sensor 2. Accurate measurement results, conversion of three alcohol measurement units (% BAC / ‰ BAC / mg/l) 3. LCD digital display result with blue backlight 4. Rapid response and recovery 5, automatic shutdown 6. Automatic sound alarm for alcohol exceeding the limit 7. Sensor fault self-inspection 8. Low power prompt 9, bolwtorch can be replaced, delivery 5 bolwtorch Technical parameters: Sensor: Semiconductor alcohol sensor Warm-up time: less than 10 seconds Response time: less than 5 seconds Test Range: 0.000-0.199% BAC & 0.00-1.99‰ BAC & 0.00-0.99 mg/l 1. Sensor: advanced flat surfaced alcohol sensor 2. Warm-up time: within 10 seconds 3. Respond time: within 5 seconds 4. Operating temperature range: 5-40℃ 5. Detection range: 0.000-0.199% BAC / 0.00-1.99‰ BAC / 0.00-0.99 mg/l 6. Digital display results (% BAC / ‰ BAC / mg/l) 7. Quick response and resume 8. Auto power-off 9. Use mouthpiece 10. Sensor fault self checking 11. Blue-colored backlight 12. Low voltage indicator 13. Power input: 3V (32x "AAA" alkaline battery, not included)