Funciones: 1. Digital Breath Alcohol Tester . 2. Digital display results (% BAC / g/l). 3. Red Backlight(optional). 4. Alert level calibrated. 5. Quick response and resume. 6. Auto power off. Especificaciones: 1. Sensor: advanced semiconductor oxide alcohol sensor. 2. Detect range: 0.00-0.19% BAC / 0.0-1.9 g/l. 3. Warm-up time: within 10 seconds. 4. Respond time: within 5 seconds. 5. Operating temperature range: 10~40. 6. Environmental temperature: 40%-90%. 7. Power input: use 2x "AAA" alkaline batteries (not included). 8. Unit size: 102*34*18 mm.