Technical information: Sensor type: Fuel – cell alcohol sensor Test Range: 0.000-2.000mgl (0.400%B.A.C; 4.000 B.A.C; 4.000gl) Alarming level: 0.250 mgL (could be modified) Working Environment: Temperature: 0-50 degree humidity: less than 95%RH No Dews Power: 2 AA NiMH batteries, rating capacity: 2.1AH (Auto power off) Dimension l b h: 110 65 28mm Weight: 120g excluding battery Accuracy: 0.400 0.050 mgL 0.400 – 1.000 20% 1.000 – 2.000 30% (mgL is alcohol concentration unit from your breath)