With advanced semi-conductor sensor, utilizes the same police-grade technology trusted by hospitals, clinics, and even law enforcement. These professional organizations trust our breath alcohol testers because they know they are the most accurate and reliable results possible, every time they test. Just one-button operation, it's easy to turn the device on and test it in seconds. wait for 10 seconds for warming-up, then blow with the tester for 5-6 seconds, the result will after 3 seconds. Please test after drinking for at least 20 minutes. breath alcohol tester easily fits in a pocket or purse, making it a great portable breathalyzer for any occasion.Great for wedding, parties or other social activities, With the LCD display, it is easier to read even in less than optimal light conditions and offer professional precision for safe driving. It will give you an alarm by beeping when the allowable limit is exceeded and the warning and danger symbol is displayed. features: 1. Digital display of alcohol concentration results with beeps 2. Alarm point can choose red light backlight 3. Automatic shutdown power saving function 4. The mouthpiece is replaceable, and 5 mouthpieces are delivered. 5. Warm-up time: 10 seconds Response time: within 5 seconds 6. Test range: 0.00%-0.19% BAC 7. 2 "AAA" alkaline batteries (not included with this machine) In order to accurate test results, please wait 20 minutes after drinking alcohol before taking the test. It is best that the test time is more than 3 minutes from the last test. 8. Regardless of whether the product is used or not, manufacturers and sellers will not bear any responsibility for illegal activities. For example: drunk driving, working at heights. Everyone reacts differently to alcohol, so the test results are for reference only and cannot be used as a criterionfor determining the results. Material: plastic colour: Black Package Contents: 1 x Alcohol Tester 5 x mouthpiece Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.