Upgraded Alcohol Tester The advanced high-precision nanotechnology sensor will immediately provide you with the most accurate value, and comes with ten spare Mouthpieces for you and your family or friends to use. Easy to operate, easy to carry, save space for you, you can put it in your pocket or bag when you are partying with friends. Easy to operate Prepare 3pc AAA batteries in advance, turn on the power button of the alcohol tester, wait 15 seconds for the warm-up time, When the screen displays 10, blow evenly for 4-5 seconds, and the result will be displayed on the LCD screen within 3 seconds.(3 AAA batteries required - not included) ENERGY SAVINGS Breathalyzer can set automatic shutdown. Powered by 3pcs AAA batteries (not included), it automatically turns off after 10 seconds to save power. Each time you install a battery, you can test more than 500 times. In addition, low-power instructions were designed. COMPACT & CONVENIENT The product is only 60g and can easily be carried in your purse or pocket. Ideal for weddings, parties, banquets or other social events to ensure you drive safely after drinking. 10 MOUTHPIECES Equipped with 10 interchangeable mouthpieces, which can be cleaned and recycled.It is much easier for your family or friend to test. Warm Tips: Must be equipped with a mouthpiece before blowingDO NOT test immediately after drinking alcohol. Test after drinking alcohol for 20 minutes and rinse your mouth with water firstlt. DO NOT blow air immediately after turning on the machine. The product will have a self-cleaning time of 15 seconds every time it is turned on.DO NOT blow hard directly on the air inlet of the product in any case.After 15 seconds of starting up, it will enter the blowing countdown. The countdown is 10 seconds. When blowing, it should be blown out evenly until the displayed value is, DO NOT suddenly big or small or interrupted, repeat the above operation 3-5 times, the result is based on the average value.