Features: High Precision Chip: Breathalyzers Upgraded 5.0 High sensitive sensor for BAC test, so that you can get fast and accurate results, and provide you with a sense of security when you are driving. It is suitable for personal home and party, or gift. Diversified and Thoughtful Design: In order to provide a good customer experience for the alcohol tester, engineers have specially designed a space for the mouthpiece in the battery box. When you don't need to use the alcohol breathalyzer tester, you can put the mouthpiece inside to keep it clean and prevent loss. This is a thoughtful design. When you are in a dimly lit place or need higher brightness, you can take out breathalyzers with its mini flashlight design, which may be useful in emergency situations. Portable Breathalyzer: The product is only 60 g and can easily be carried in your purse or pocket. Ideal for weddings, parties, banquets or other social events to ensure you drive safely after drinking. Fast and Easy Test: Install 3 AAA batteries (AAA batteries is not included) and mouthpiece, long press the start button, after a "beep" the screen displays "WAIT" and starts the countdown, the screen displays "START", take a deep breath and keep blowing for 5 seconds, you can see the result.