Welcome to our shop This professional breathalyzer is designed to provide fast and accurate results. It uses semiconductor sensors to measure BAC levels, ensuring safe driving. Its small and lightweight design makes it a convenient companion for home, travel, and party drinking. It is easy to use, with 3*AAA batteries included. Simply press the button for 1 second to start, wait 15 seconds for it to warm up, then blow into the breathalyzer for at least 5 seconds. You will receive real-time answers within 3 seconds. The breathalyzer offers three units of measurement to meet your needs. To maintain hygiene, the breathalyzer comes with reusable mouthpieces. These mouthpieces can be cleaned and recycled, ensuring cleanliness and convenience. With 5 mouthpieces included, you can share it with your friends and family without any worries. The compact and portable design allows you to carry the breathalyzer in your car or bag easily. We also provide a storage bag that perfectly fits the breathalyzer and mouthpieces, making it even more convenient to carry. You can check BAC levels anywhere and anytime. Kindly remember that alcohol concentration reaches its maximum 20 to 30 minutes after drinking. We recommend waiting 20 minutes before taking the test for more accurate results. Additionally, it is advisable to wait three minutes between each test for the best accuracy. Note: 1. Please allow small size error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. (Customer satisfaction is our top priority. If you find any product problems after receiving the goods, such as damage or incorrect quantity, please contact us immediately. We will try our best to provide you with satisfactory after sales service) Thank you for meeting me.I hope this helps you. Wish you a happy life.