High Accuracy Sensor Breathalyzer: You can get the accurate blood alcohol concentration with the upgraded high-sensitivity semiconductor sensor in seconds. Breath alcohol tester with backlit LCD display for easy viewing of the test result at night. Smart Alarm Function: According to different traffic laws in European countries, you can set the alarm value by yourself (0.20BAC / 0.30BAC / 0.50BAC / 0.80BAC). The buzzer will sound prompt if your alcohol level exceeds the value you set. One Button to Test: Semiconductor Breathalyzer is easy to use. Simply insert the batteries (2x AA batteries are required (not included)) and press the power button to start testing. 12 Replaceable Mouthpieces: This alcohol tester comes with 12 replaceable mouthpieces which can be cleaned and recycled. Alcohol tester is small enough to keep in your car, purse, backpack or briefcase. Especially we prepared a velvet bag portable in your car and a perfect gift for your friends. Tips: When you have been drinking, it is recommended to wait 20 minutes before testing, this is because 20 minutes is approximately the alcohol in Blood from the digestive organs. Please wait at least 3 minutes to start the next test after the last test. Attributes: Product Name: Car Breathalyzer Size: 4.7*1.8*0.8inch Color: Black Quantity: 1 piece