Usage Tips:Product Name: Alcohol Tester Display mode: liquid crystal display; Range: 0.00-1.9%BAC&0.0-1.9g/l or 0.00-0.95mg/l BRAC Accuracy: 0.01%BAC(0.1g/l) Battery: 1.5V AAA X 2 (not included with this machine) Dimensions: 100mm X 45mm X 20mm Weight: about 25 grams (without battery) Color: White Other accessories: Comes with a lanyard Instructions for use: 1. Press the switch once, the LCD display of the tester will light up, and at the same time, it will make a sound of "". 2. The state warm up number will jump from 10 to 0, and then the state blow 10 will jump to 0, and the preheating process will be completed. 3. At the first 6 seconds, put your mouth close to the breath test sensor, and exhale into the sensor for 3-5 seconds. 4. The display can read the test results. 5. When the test result is in the following range, the words "Caution" and "Warning" will be displayed 0.02% BAC(or 0.2g/l) to 0.05% BAC(or 0.5g/l) 0.05% BAC(or 0.5g/l) to 0.08% BAC(or 0.8g/l) 6. When the test result is in the following range, the word "Danger" will be displayed. over & EQUAL 0.05% BAC (or 0.5g/l) over & EQUAL 0.08% BAC (or 0.8g/l) "Regulations on Blood Alcohol Content for Drivers of Motor Vehicles" Mandatory Standard: Regulation of Blood Alcohol Content Driving a motor vehicle when greater than or equal to 0.2mg/ml is drunk driving [Drunk driving when driving a motor vehicle when greater than or equal to 0.8mg/ml]