•Three levels of blood alcohol content, test the green light continuously to indicate safety: the alcohol concentration is less than 0.02% BAC (or 0.1mg/l BRAC); the yellow light indicates a warning: the alcohol concentration is within 0.02% BAC (or 0.1mg/l BRAC) to 0.05 % BAC (or 0.25mg/l BRAC); the red and yellow lights are on at the same time to represent danger: the alcohol concentration is higher than 0.05% BAC (or 0.25mg/l BRAC) •The LED light displays intuitively, telling you the result of the alcohol content straightforwardly •One-key design is simple to operate, the one-key operation to measure, simple and fast results •The tester has a flashlight lighting function and an orange super bright LED light •The mini alcohol tester has a keychain, the size is 73 x 39 x 20mm, and the weight is 22.6g. It is compact and easy to carry •Instructions for use: first install 2 x AAA batteries (Not included ) to the alcohol tester, press and hold the POWER button, while blowing into the collection port, there will be a collection time of 5 seconds (the yellow light and red light will be on at the same time On), afterward, if only the green light is on, it is safe, only the yellow light is on is the warning state, and the red light is on is the dangerous state Notes: •After drinking, it is recommended to wait for 20 minutes before testing, because it takes about 20 minutes for the alcohol to enter the blood from the digestive organs, and the residual alcohol in the mouth also needs time to dissipate. •To get more accurate results, there should be three minutes less time between each test. •Do not use products containing benzene, gasoline, and thinner to clean the tester. •Do not let any liquid seep into the sensor. •Remind you, for your safety and the safety of others, do not drink and drive. Package included: •1 x Alcohol Tester •1 x English and Chinese Manual