FAST AND VERY ACCURATE: The breathalyzer is powered by an extremely complex cellular sensor and uses the same police technology found in hospitals, clinics and even law enforcement. It can provide these professional organizations with the most accurate and reliable blood alcohol content results, as well as detect traces of alcohol, with reliable BAK values up to the third third digit after the decimal point.</ LCD DISPLAY: Easy to use Fully charge the breathalyzer with USB, then just press the power button, start the test. Your BAC results will be displayed seconds later on a bright LCD screen that's supposed to give you professional accuracy for safe driving. AUTO ALARM: With the push of a single button, it's easy to turn the device on and test it in seconds. If the alcohol level is exceeded, the beeper will sound automatically. MOTOR SAVING: Auto power off, powered by two AAA batteries (not included but generally available). It will automatically turn off to save power when you complete the test for 20 seconds. EXQUISITE DESIGN: Compact and lightweight, easy to carry. Inform the concentration of alcohol in your body in time and let him know whether you are allowed to drive. The digital alcohol tester is a fun gadget for on the go and at home. The tester slips easily into your pocket. Specifications: Item Type: Alcohol tester Material: plastic Color: white Battery type: 2 * AAA (not included) Sensor: Advanced Semiconductor Alcohol Sensor Range: 0.000% to 0.199% BAC (0.00 to 1.9 g/L) Accuracy: 0.01% BAC Warm up time: 10s Response time: <5s Display: LCD Item Size: 9.5*3.5*1.3cm/3.7*1.4*0.5inch Package list: 1* alcohol tester 1* hanging rope</ Note: 1. The warm-up goes from 10 to 0, then from 10 jumps to 0 to complete the warm-up. 2. Start counting down to 6 seconds and block your mouth near the breath sensor, then exhale into the sensor for 3-5 seconds.