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: Name: Portable Tester Sensor: high sensitivity direct thermal sensor Test range: 0.000~0.19%BAC Accuracy Voltage: ±0.005%BAC Voltage: 3.7V Material: ABS Color: black, white Response time: less than 10S Blowing time: 3-5 seconds Preheating time: 10S Working temperature: 5-85 Battery capacity :Li Battery 270mah ( Included) Product size: (approx.)7.5*4*1.8cm/2.95*1.57*0.71inch Power supply: USB charging interface Net weight about 22.5g Package List: 1* Tester 1* USB Charge Cable 1* Instruction Manual Warm Tips: The test results are accurate 20 minutes after drinking. Testing immediately after drinking will only show the current level of alcohol in your mouth. Please wait at least 3 minutes before the next exam.