Features: Keep the bottom line of safety for you, and drive to work in the early morhing without a hangover. LCD high-definition digital display precise and easy to read accurate and sensitive, at a glance. Language algorithm, high induction chip, precision chemical sensors, present precise values. Based on high-precision chips and for smart sensors, other impurities are filtered and only alcohol is left, and the test is more accurate. Blow detection, quick check, no blowpipe contact required, avoid blowpipe breeding of bacterias, blowing without contact, measurement is healthier. Built-in purification chamber scientific filtering remove air only alcohol, the quality of alcohol is too large to flow downward, impurities are automatically discharged for more accurate detection. Specifications: Material: Plastic Size: As Picture Shown Color: Black/White Sensor type: Semiconductor type sensor Display: LCD liquid crystal display (black and white) for Shell material: ABS plastic Test range: 0.00-0.19%BAC(0-1.9g/l) Measurement unit: mg/l (BrAC) mg/ml (BAC) Measurement mode: quick check, automatic detection Measurement time: 20 seconds Power supply mode: built-in rechargeable polymer lithium battery Using battery: 3.7V 140MAH can be tested 150 times continuously Power adapter requirements: DC5V 1A Working temperature: 0-45 Warm-up time: 10 seconds Blowing time: within 10 seconds, more than 4 seconds required Response time: less than 5 seconds Working current: 250MA (max) Standby current: less than 20UA Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings. Package includes: 1x Alcohol Breath Tester 1x Instruction Manual