Electronic Breathalyzer, Help You Drive SafelyThe alcohol tester is designed to estimate the blood alcohol level with reliable and accurate results, helping you make a smart decision. Perfect for personal use, also for your family and friends with the other 5 mouthpieces provided. Friendly Design: When the test results are higher than 0.050% BAC or 0.500 BAC or 0.250 mg/L, it will send out an alarm signal to inform you. Specification: Sensor: High-precision semiconductor sensor Warning point: 0.050% BAC; 0.500 BAC; 0.250 mg/L (BrAC) Warm-up time: within 15 secondsRespond time: within 5 seconds Digital display results (%BAC/BAC/mg/L) Power supply: 3V (3 x "AAA" alkaline battery not included) Notes: 1. Once it turns on, it will take 15 seconds to warm up. Then it will sound a buzzer and inform you to enter the device. Both are programmed so you know exactly how to do it. 2. Do not use the breathalyzer until it is 20 minutes since the last drink; 3. To ensure the accuracy of the test result, wait at least 3 minutes to start the next test after the last test. 4. Do not use it in the environment of paint, pesticides, alcohol and other corrosive gases;