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-infection. 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 preheating period, blow steadily from 2-3cm away from the mouthpiece for at least 3 seconds (do not touch the device or inhale through the mouth). Wait a few seconds for the results to be displayed and announced via voice output. [Three-Color Indicator High-Precision Breath Alcohol Tester]: Elevated alcohol levels: blood alcohol content ≥0.02% BAC and <0.08% BAC triggers the yellow light and alarm. High alcohol levels: blood alcohol content ≥0.08% BAC triggers the red light and alarm. Green light indicates no detectable alcohol. Specifications: Product Name: Breath Alcohol Detector Battery: Built-in lithium battery (200mAh) Charging Input: 5V1A Operating Voltage: 3.7V Sensor Type: Semiconductor gas sensor Alcohol Measurement Range: 0–200mg/100mL Net Weight: 23g Dimensions: 9.3 x 2.5 x 2.4cm Indicator Lights: Red (high alcohol), Yellow (elevated alcohol), Green (no alcohol detected) Package Includes: 1 x Alcohol Tester 1 x Charging Cable 1 x User Manual