Function: 1. This tester uses a high-accuracy solid-state sensor that only takes 5 seconds to get the result to assess whether you can drive with high accuracy 2. When the concentration of respiratory factor to be measured exceeds 0,5%, tester will emit alarm. There are 3 tips: safety, warning and danger. This tester has the advantages of automatic shutdown and audible alarm 3. Tester is very convenient to use. Simply insert the two included AA batteries, turn on the tester and start the test. Suitable for weddings, parties, banquets or other social events to ensure safe driving after drinking alcohol 4. Your results will be displayed on the bright LED screen after 10 seconds. This small and lightweight, portable tester is perfect for tucking away in your back pocket. No matter where you are, you can take it with you. 5. Tester will turn off automatically 5 seconds after the test is completed, saving energy and protecting the environment. This portable tester is the first choice for all security-conscious customers Specification: Item Type: Tester Drunk Driving Size: approx. 12 x 4.5 x 2.5 cm / 4.7 x 1.8 x 1 inch Simply insert two 1,5V AA batteries, turn on the tester and start the test. Very practical and easy to use. Operating instructions: Step 1. Fully charge the tester and turn it on by pressing the button. Step 2. Wait 15 seconds while flashing. Step 3. “Blow” with “bip” sound, then start blowing. Step 4. Review the results. Product Description: This portable tester is easy to use. Simply press the button and blow into the folding mouthpiece to accurately read the concentration of we blood in seconds. It comes with 6 mouthpieces and 1 canvas bag that can carry out hygiene tests on multiple people and carry it with you. Suitable for weddings, parties, banquets or other social events. High accuracy and easy to read The sensitive semiconductor sensor accurately displays content in seconds. Thanks to the wide backlit LCD display, the results are easy to read. List of packages: 1 x Tester drunk driving6 x Mouthpiece1 x Material bag1 x User manual Note: [Reminder] To ensure the accuracy of the test results, check the breath meter 20 minutes after drinking, blow gently and evenly 3 times after warming up for 15 seconds and take the average value to check the concentration. Because it takes 20 minutes to absorb from the digestive tract into the blood. If you are examined immediately after drinking, the result will only show the concentration in the mouth, not the concentration of we blood.