High-precision breath sensor: With the upgraded high-sensitivity semiconductor sensor, you can get an accurate blood alcohol concentration in seconds. Breath alcohol tester with backlit LCD display for easy viewing of test results at night. Intelligent alarm function: According to different traffic regulations of European countries, the alarm value can be set by yourself (0.20 BAC / 0.30 BAC / 0.50 BAC / 0 , 80 BAC). If your alcohol level exceeds the value you set, the buzzer will sound. One-touch testing: Solid state breath analyzers are easy to use. Just plug in the battery. Requires 2 AA batteries (not included) and press the power button to start the test. Reminder: If you already drink alcohol, it is recommended to wait 20 minutes before taking the test, this is because 20 minutes is about alcohol in the blood of digestive organs, please wait at least 3 minutes after the last test before starting the next test. Size: 4.7*1.8*0.8inch Packing List: 1 Piece Alcohol Tester