1、This tester uses a high‑accuracy semiconductor sensor, which only takes 5 seconds to give the result to judge whether you can drive with high accuracy 2、When the concentration of breath agent for measuring exceeds 0.5%, the breath tester will sound an alarm. There are 3 tips: safety, warning, and danger. This tester has the advantages of automatic shutdown and sound alarm 3、The tester is very convenient to use. Simply insert the two included AA batteries, turn on your tester, and start the test. Suitable for weddings, parties, banquets or other social events to ensure that you drive safely after drinking 4、Your results will be displayed on the bright LED screen after 10 seconds. Small and light, this portable tester is perfect for putting in your back pocket. No matter where you are, you can take it with you. 5、The tester will automatically shut down 5 seconds after the test is completed, energy saving and environmental protection. This portable tester is the first choice for all safety‑conscious customers Item Type: Drunk Driving Tester Size: Approx.12 x 4.5 x 2.5cm / 4.7 x 1.8 x 1in Battery powered (not included) Just insert two 1.5V AA batteries, turn on your tester, and start the test. Very practical and easy to use. Product Manual: Step 1. Fully charge the tester and turn it on by pressing a button. Step 2. When flashing, please wait 15 seconds. Step 3. "Blow" with a "beep" sound, then please start blowing. Step 4. Review the results.Product Description: This portable tester is easy to use. You only need to press a button and blow into the folding mouthpiece to accurately read the blood concentration in a few seconds. It comes with 6 mouthpieces and 1 cloth bag, which 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 the content within seconds. With wide LCD backlight display, the results are easy to read. 1 x Drunk Driving Tester 6 x Mouthpiece 1 x Cloth Bag 1 x User Manual