Simple operation, fast: you only need to press the on/off button for 1 second to turn on the alcohol tester, and then take 10 seconds to warm it up. After 3-5 seconds of blowing into the inhaler, the test result is displayed on the LCD screen of the alcohol tester, designed with blue background lighting, easy to read. Fast response and accurate result. Professional alcohol tester: this alcohol tester has a very accurate semiconductor alcohol sensor. No mouthpiece is needed, which makes it easier to carry. It has a built-in purification chamber, which can filter any impurities and accurately detect the alcohol content. It can quickly give a result to assess whether you can drive or not. Compact and portable: this breathalyzer for testing the alcohol content in the blood has a format that fits easily in a bag or pocket, is hung on a key chain or placed in a car, even with other medical supplies. Super compact design, easy to hold and carry wherever you go. Ideal for drivers. A warm reminder: after drinking it is recommended to wait 20 minutes before taking the test, because alcohol enters the blood via the digestive organs in about 20 minutes and the remaining alcohol in the mouth time needs to evaporate. Wait three minutes between each test for a more accurate result.