[High sensitivity and precision] This breathalyzer uses advanced semiconductor technology to ensure an accurate reading in a short time. Quickly assess whether you can drive after drinking. [3 Unit of measurement] There are 3 units of measurement to choose from, % BAC, BAC, mg/l, It will automatically turn off after 3 minutes of testing without pressing. Do not use the breath analyzer until 20 minutes have passed since the last drink. Please wait at least 3 minutes to start the next test after the last test. [Portable and easy to use] This breathalyzer is small and lightweight and fits perfectly in your pocket. You can take it with you when you go to parties, weddings or social events. Ensure your safety while driving after drinking. [5 Tips Included] Test yourself, your friends and family with the different tips. Drive safely and protect your family. [Backlit LCD Display] The clear blue backlit LCD display provides clear reading even at night. Delivered quantity: 1 piece Product color: black Features: Advanced nano-semiconductor alcohol sensor; Quick response , fast and convenient recovery and detection; SMD assembly process, stable and reliable performance; Artificial intelligence microcomputer control; The test process screen is visually displayed; Digital and graphical character LCD display with blue backlight; Portable, compact and lightweight design; Automatic sound alarm when alcohol limit is exceeded; Self-checking sensor faults; Intelligent power-saving design, undervoltage indication battery Using the product 1. Open the battery cover of the back cover of the machine, put 3 AAA, 1.5V batteries into the machine according to the polarity, and then install the battery cover to put it into use. < p>2. Press the "Power On" button, accompanied by a short beep, the backlight turns on, and the screen displays a countdown from 100 to 000. The lower part of the screen displays the word "WAIT", prompting the machine to run the preheating program, please do not blow it at this time. gas, otherwise it will affect the accuracy of the test. After the warm-up is completed, the "WAIT" display disappears, the detector beeps and the word "BLOW" is displayed at the same time, and the letter "C" swims up to display. < p>Note: During the preheating process, the countdown speed is related to the last test concentration, the lower the concentration, the faster the countdown, otherwise the slower it is. 3. The test subject takes a deep breath and when the letter "C" appears on the screen, aim at the mouthpiece of the machine and blow continuously and evenly until the machine beeps and stops blowing . 4. When blowing is completed, the screen will display the symbol "" and the word "TEST" at the same time, indicating that the test results are being analyzed. Do not blow at this time, otherwise the test results will be affected. After analysis, the concentration value displayed on the screen is the breath alcohol content of the tester. After the value stays for a few seconds, the machine will automatically shut down. 5 . If you want to perform the following test, you need to press the "Power On" button again, and the process refers to points 2 to 4 above. Instructions for use 1. Press the switch once, the tester's LCD screen will light up and at the same time it will make a "beep" sound. 2. The number will change from 10 to 0 to complete the preheating process. 3. Bring your mouth to the breath test sensor and exhale into the sensor for 3-5 seconds. 4. The display screen can read the test results. Good quality product