1. Black screen scarlet letter display and three-gear LED light display. 2. Five testing units (%BAC,BAC(g/L)mg/L, mg/100ml) are equipped with 10 nozzles. 3. Loud sound alarm saves electricity and automatically shuts down. 4. Preheating time: 20 seconds; response time: 5 seconds. 5. Test range: 0.000-0.199% BAC Alarm point: 0.050%BAC. Accuracy: 0.010%BAC Sensor: semiconductor alcohol sensor Preheating time: 20 seconds Response time: less than 5 seconds Test range: 0.00-0.19% BAC, 0-1.99BAC(g/L), 0-0.995mg/L, 0-199mg/100ml. Power supply: 3 "AAA" alkaline batteries (not included with this machine) Working temperature: 10-40 degrees Celsius Color: Black Material: ABS Package Contents: 1 * Alcohol Tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.