Fast and Accurate: The breathalyzer is powered by a high-quality fuel cell sensor and uses the same technology employed by hospitals, clinics, and law enforcement agencies. It delivers accurate and reliable BAC results, capable of detecting traces of alcohol and measuring high BAC levels up to three decimal places. Auto Alarm: One-touch operation – easy to turn on and perform a test within seconds. If the alcohol level exceeds the preset limit, the alarm will sound automatically. LCD Display: This professional portable breathalyzer starts with a simple press of the power button for 2 seconds. Wait 10 seconds for warm-up, then blow into the device steadily for 5 seconds. Results are displayed on the LCD screen within 3 seconds and remain visible for 10 seconds. Energy Efficient: Features automatic shut-off to conserve battery life. Powered by two AAA batteries (not included). The device turns off automatically 20 seconds after testing. Exquisite Design: Compact and lightweight design makes it easy to carry. Quickly check your blood alcohol concentration and determine if it's safe to drive. This digital breathalyzer is a convenient tool for personal use at home or on the go. Easily fits into your pocket.