Feature:  1.Accurate reading;  2.Large capacity battery;  3.USB charging;  4.Recycle;  5.Dust-proof design;  6.No contact,more hygienic;     Specification:  Sensor Type: Semiconductor sensor;  Display: LCD liquid crystal display (black and white);  Shell Material: ABS plastic;  Test Range:  0.00-0.19%BAC (0-1.9g/l);  Unit Of Measurement:  mg/l (BrAC) mg/ml (BAC);  Measurement Mode: Quick investigation, automatic detection;  Measuring Time: 20 seconds;  Power Supply: Built-in rechargeable polymer lithium battery;  Use Battery: 3.7V 140mAh can test 150 times continuously;  Power Adapter Requirements: DC5V 1A;  Working Temperature: 0-45℃;  Warm-Up Time: 10 seconds;  Blowing Time: Within 10 seconds, the requirement is greater than 4 seconds;  Response Time: Less than 5 seconds;  Working Current: 250MA (max).