User-friendly: Graphic interface and animation, one-hand operation Enhanced feature: Sensor auto-self cleaning Product specifications: Range: Low & 0.2 ~ 1.30 %oBAC Accuracy: +/-0.2 %oBAC at the calibrated point (alert level). Power input:3 x 1.5v AAA batteries(not included) Display: Graphic bar display with 0.1%oBAC 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%oBAC Agency approval: CE Accessories:3 pcs blowing tubes 1 pcs cleaning caps