Features: [Accurate Testing]: The breathalyzer uses an ultra-precision semiconductor gas sensor to accurately display your results on the LCD screen. Our non-contact breath test eliminates the need for frequent replacement of mouthpieces and avoids cross-contamination. Preheat for 10 seconds and complete the breath test in seconds. [Simple Operation]: Long press the power button for 2 seconds. After the 10-second warm-up period, blow steadily from 2–3 cm away from the mouthpiece for at least 3 seconds (do not touch the device or inhale during testing). Wait a few seconds for the results to be displayed and announced via voice feedback. [Three-Color Indicator High-Precision Breath Alcohol Tester]: Impaired driving is defined as operating a vehicle with a blood alcohol content (BAC) of ≥0.02% and <0.08%. The yellow indicator light activates with an audible alert. Severe impairment is defined as a BAC of ≥0.08%. The red indicator light activates with an audible alarm. Specifications: Product Name: Breath Alcohol Detector Battery: Built-in lithium battery (200mAh) Charging Input: 5V/1A Operating Voltage: 3.7V Sensor Type: Semiconductor gas sensor Alcohol Concentration Measurement Range: 0–200mg/100mL Net Weight: 23g Dimensions: 9.3 x 2.5 x 2.4cm Indicator Lights: Red (high alcohol level), Yellow (moderate alcohol level), Green (no alcohol detected) Package Includes: 1 x Alcohol Tester 1 x Charging Cable 1 x User Manual