Features: Large HD LCD screen display with led lights indicating drunk driving/ drink drinking/ driveable. Precision algorithm that removes impurities and retains only for more accurate results. No mouthpiece contact required, safer and more hygienic to use. Smart chip and highly sensitive sensor for more accurate measurement. Built- in 140mAh rechargeable battery, the breathalyzer can be used about 150 times with one charge. Recommended to start the test 20 minutes after drinking, the result is more accurate. Specification: Sensor type: semiconductor sensor Display: LCD liquid crystal display ( black and white ) Test range: 0. 00- 0. 19% BAC ( 0- 1. 9g/ l ) Measurement units: mg/ l ( BrAC ) mg/ ml ( BAC ) Measurement mode: quick investigation, automatic detection Measuring time: 20 seconds Power supply: Built- in rechargeable polymer lithium battery Battery capacity: 3. 7V 140mAh, can test 150 times continuously Charging input: DC5V 1A Working temperature: 0- 45℃ Preheat time: 10 seconds Blowing time: within 10 seconds, the requirement is greater than 4 seconds Response time: less than 5 seconds Shell material: ABS Color: Black Note: Please allow 1- 3cm ( 0. 4- 1. 18" ) difference due to manual measurement and slight color variation for different display setting. Package Including Package Included: 1* Breathalyzer 1* USB cable 1* User manual