Product features: 1. Profeional airway setup 2. Three alcohol measurement unit conversions (%BAC/BAC/mg/L) 3. LCD digital display results with blue backlight 4. Quick response and recovery 5. Automatic shutdown 6. Low battery prompt 7. The mouthpiece can be replaced with five mouthpieces Features: Advanced nano-semiconductor alcohol sensor; Quick response, quick recovery, quick and convenient detection; SMD aembly proce, stable and reliable performance; Artificial intelligence microcomputer control; Visual display of the test proce screen; LCD digital and character graphic display with blue backlight illumination; Portable design, compact and lightweight; Automatic audible alarm for alcohol over-limit; Sensor fault self-check; Intelligent power-saving design, battery under-voltage indication Product box specifications: Product size: 1126129mm Product net weight: 69g Product gro weight: 196g Instructions for use: Pre and hold the "POWER" button on the front of the screen for 1-3 seconds to enter the sensor warm-up countdown proce of about 10 seconds. When you see the words BIOW appear on the screen, start to blow (continuously blow air to the blowing hole for about 3-6 seconds, enter a reaction period of about 5 seconds, and the test result will be displayed on the LCD, and it will automatically shut down after about 5 seconds. Hold your mouth close to the breath test sensor and exhale into the sensor for 3-6 seconds. The display can read the test results. The word "Caution" is displayed when the test results are within the following ranges 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) The words "Danger" and "Dangerous" are displayed when the test results are within the following ranges. over & EQUAL 0.05% BAC (or 0.5g/l) over & EQUAL 0.08% BAC (or 0.8g/l) Alarm sound description: When the test result is lower than the preset alarm point, and the difference is greater than 0.2BAC, the test result will be displayed digitally, and there will be no alarm sound. When the test result is lower than the preset alarm point, and the difference is le than or equal to 0.2BAC, the test result will be displayed digitally, and there will be a pre-alarm sound. (This function is only available when the alarm point is greater than 0.20BAC. ) maintenance: Do not use solvents such as benzene, thinner or gasoline to clean this product to avoid damage to the body shell. Prevent drops and strong shocks, which may cause the unit to malfunction. Do not attempt to repair, modify or disaemble parts except to replace the battery. If the product is not used for a long time, please remove the battery to avoid damage to the machine due to battery leakage. Product use: 1 Open the battery cover of the back shell of the machine, insert 3 AAA, 1.5V batteries into the machine according to the polarity, and then install the battery cover to put it into use. 2 Pre the "Power On" button, accompanied by a short beep, the backlight will light up, and the screen will display a countdown from 100 to 000, and the word "WAIT" will be displayed on the lower part of the screen, prompting the machine to run the preheating program, please do not blow at this time, Otherwise, the test accuracy will be affected. After the warm-up is completed, the "WAIT" display disappears, the detector emits a beep, and the word "BLOW" is displayed at the same time, and the letter "C" swims to display. Note: During the preheating proce, the countdown speed is related to the last test concentration, the lower the concentration, the faster the countdown, otherwise the slower. 3. The test subject takes a deep breath, and when the "C" letter on the screen is displayed, aim at the mouthpiece of the machine and blow continuously and evenly until the machine beeps and stops blowing. 4 When the blowing is over, the screen will display the symbol "" and the word "TEST", indicating that the test results are being analyzed. Do not blow at this time, otherwise the test results will be affected. After the analysis, the concentration value displayed on the screen is the alcohol content in the breath of the tester. After the value remains for a few seconds, the machine will automatically shut down. 5 If you want to perform the next test, you must pre the "Power On" button again, and the proce refers to the above 2~4. Instructions for use: 1. Pre the switch once, the LCD display of the tester will light up, and at the same time, it will make a "beep" sound. 2. The number will jump from 10 to 0 to complete the preheating proce. 3. Put your mouth close to the breath test sensor, and exhale into the sensor for 3-5 seconds. 4. The display screen can read the test results. 5. When the test results reach the following ranges, 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 reaches the following range, the words "Danger" and