LCD Display This breathalyzer has a digital LCD display with blue backlight for easier viewing at night. Even in a dark environment, you can see the figure clearly with wet fingers. LCD gives you a clearer view, and the digital alcohol automatically gives you a wheat alert. Quality Assurance Excellent service from quality, fast delivery, simple after-sales service. We promise a satisfaction guarantee as best we can. If you are not satisfied with the product or have any problem, do not hesitate to contact us and let us know about the matter, you will be assisted as soon as possible. Automatic alarm function This lie detector has a sound alarm function, the buzzer will alarm automatically when the alcohol content is exceeded. Simple method to analyze blood alcohol concentration anytime and anywhere. Blowing design with five mouthpieces for multiple users. Advanced Semiconductor This breath tester can measure your alcohol level in seconds, which would ensure whether it is safe to drive after drinking. The product has been thoroughly tested before shipping to ensure the perfect product. Quality Assurance Excellent quality service, fast delivery, easy after-sales. We promise a satisfaction guarantee as best we can. If you are not satisfied with the product or have any problem, do not hesitate to contact us and let us know about the matter, you will be assisted as soon as possible. Quality Assurance Excellent service quality, fast delivery, simple after-sales service. We promise a satisfaction guarantee as best we can. If you are not satisfied with the product or have any problem, do not hesitate to contact us and let us know about the matter, you will be assisted as soon as possible.