Feature: 1. BUILT IN PURIFICATION BIN: Portable breath alcohol tester built in purification bin, filtering impurities, accurate detection of alcohol content. 2. THREE COLOR INDICATION: Alcohol tester adopts the screen three color indication design, a total of green, yellow and red three colors, accurate and convenient detection. 3. HANGING HOLE DESIGN: Portable alcohol tester with hanging hole design, you can tie the lanyard to use, free your hands, very convenient. 4. PORTABLE: Rechargeable alcohol tester small size and light weight, compact and portable, will not occupy too much space, easy to carry and use. 5. USB CHARGING: Alcohol detector is charged by USB and has a long standby time, when the power is used up, it can be charged via USB to continue using. Specification: Item Type: Alcohol Tester Material: ABS Battery Voltage: 3.7V Blowing Time: 10 Seconds ( Generally 3‑5 Seconds Can Be) Preheat Time: 10 Seconds Response Time: <5 Seconds Alcohol Concentration Range: 0.0g/L‑1.9g/L (BAC 0.00%‑0.19%) Working Temperature: 5‑85℃ Battery Capacity: Li Polymer Battery 220mah ( Included) Standby Time: 100 Day Gross Weight: 63g/2.2oz. Package List: 1 x Alcohol Tester1 x Instruction Manual1 x Power Cord