Usage Tips:Features:*1. Lightweight and compact for easy carrying.*2. Two detection modes can meet the needs: the precise mode requires the installation of a mouthpiece, and the detection is more accurate; the fast mode does not require a mouthpiece and is suitable for multiple people to quickly check for alcohol.*3. Equipped with smart chips and high-sensitivity sensors, the measurement is more accurate.*4. Accurate values, the high-definition large screen displays the alcohol concentration, the red light turns on when the concentration exceeds 20ml/100ml, and the audible alarm is automatically triggered.*5. USB rechargeable lithium battery avoids frequent battery replacement.Device Description:*1. Display: 2.0-inch screen with dazzling green light.*2. Test range: 0.00-200mg/100ml*3. Test accuracy: 10% (mg/100ml)*4. Warm-up time: 10 seconds*5. Response time: 5 seconds*6. Power battery: 3.7V/200mAh rechargeable lithium battery*7. Interface: Micro-USB (5V/1A)*8. Material: ABS*9. Size: about 3.5x13.5x4.1cmPackage includes:1 x Breathalyzer5 x Mouthpiece1 x Instructions1 x Charging cableNote: The actual color of the item might be slightly different from the color showed on the pictures:Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you for your attention.Please allow 1-2cm differs due to manual measurement.