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User-friendly: graphic interface and animation, one-hand operation Product Specifications: Range: Low & 0.2 ~ 1.30 ‰ BAC Accuracy: ±0.2 ‰BAC at the Calibrated point (alert level). Power Input: 3 X 1.5V AAA batteries(Not included) Display: Graphic bar display with 0.1‰BAC per step Tolerance compensation: Pre-alert function together with bi-color backlighting Auto power off: 2 minutes Breath sampling: about 5 seconds continuous breath sample Cycle time: about 20 seconds Unit Dimensions: 107 X 45 X 25 mm approx. Weight: 50g (without batteries) Alert level calibrated: 0.2; 0.3; 0.5; 0.8‰BAC Agency Approval: CE Accessories: 3 pcs blowing tubes