ENERGY-SAVING: Auto-off. Powered by 3AAA batteries( not included but commonly available), it will automatically shut off to save power after finishing the test for 5 seconds. each time you install batteries, you can test more than 200 times. Moreover, it is designed with low power indicationPOLICE-GRADE ACCURACY - Breathalyzer utilizes the same police-grade technology trusted by hospitals, clinics, and even law enforcement. These professional organizations trust breath alcohol testers because they know they are getting the most accurate and reliable BAC results possible, every time they test. The AD8800 can detect trace amounts of alcohol, reliably handles high BAC levels and is accurate to the third decimal place90 DAY MONEY-BACK GUARANTEE: We stand by all our products, but if you are unhappy with your products you may return it any time during the first 30 daysSMART MCU CONTROL: When the test result is above 0.05%BAC or 0.50BAC or 0.25mg/L or 50mg/100ml, it will send out audio warning to alarm you. It is also a good companion for breast-feed mothers who want to know whether they can feed their children or not after drinking through measuring their BAC(Blood Alcohol Content)SENSITIVE AND HIGH ACCURACY: Do not use the breath analyzer until it has been 20 minutes since the last drink; please wait at least 3 minutes to begin next test after last test. Dual input for right and left handed usage