High Precision SensorYou can get the precise blood alcohol concentration with the upgraded high-sensitivity semiconductor sensor in seconds. Approved digital breathalyzer recognized by all kinds of professionals. Instructions are in English. If you need English manual, please contact us. USB Rechargeable & Long LastingCome with a USB data cable, the breathalyzer is rechargeable. It is very convenient for you to Charge it by USB to your car, computer, socket or power bank. Alcohol test can last for 300 times after fully charged. Alcohol test dust-proof designSlide the button down To turn it on, blow directly into the device without contact to avoid contamination, the test is safer. And we put everything in a gift box, especially we prepared a portable velvet bag in your car and a perfect gift for your friends. 2 UNITS OF MEASUREMENTThere are 2 units of measurement to choose from ,% BAC, g/l. After 3 minutes of testing without command, it is automatically deactivated. Do not use the breath analyzer until 20 minutes have passed since the last drink consumed. Wait at least 3 minutes to start the next test after the last test. LCD Display WarningWith LCD display to see the result clearly and with 3 colors to remind you whether the alcohol test result is safe or No. They are separately green, yellow and red, green means safe, yellow is a warning and red is danger. For measurements at or above the alarm concentration level, the analyzer beeps simultaneously. Number of parts delivered: 1 Welcometomeet