High Accuracy And Easy To Read Sensitive semiconductor sensor accurately displays alcohol content within seconds. Features a wide LCD backlight display for easy reading. - High Accuracy & Digital LCD Display: This breathalyzer uses a sensitive semiconductor sensor to quickly display alcohol content levels with results up to 0.01mg/L. The red backlit screen allows for easy reading in low-light conditions. - Automatic Alarm Function: The device emits an audio alert if the breath alcohol concentration exceeds 0.50 per mille BAC. - Portable and User-Friendly Design: Compact, lightweight, and pocket-sized for easy carrying. Offers adjustable measurement units and customizable BAC thresholds. - Energy Saving: Automatically powers off 5 seconds after testing to conserve battery life. Battery level indicator included. (Batteries not included.) Easy To Use Step 1: Fully charge the device and turn it on with a single button. Step 2: Wait 15 seconds while the device warms up. Step 3: When 'BLOW' appears and a beep sounds, begin blowing steadily. Step 4: Review the test result on the display. Warm Tips: 1. If unused for 15 days, power on the device three times before next use. 2. Avoid eating or drinking for at least 20 minutes prior to testing. 3. Begin blowing within 10 seconds after the 15-second warm-up period. 4. Blow steadily and avoid letting saliva enter the device to prevent damage. 5. Perform three consecutive tests and use the median result for best accuracy. Results are for personal reference only and should not be used to determine fitness to drive. Note: 1. Slight size variations may occur due to manual measurement differences. 2. Actual product color may vary slightly due to lighting, screen settings, and photography angles. Included: 1 x Breathalyzer 1 x User Manual