Features: High-Precision: This Portable Breathalyzer uses a high-precision semiconductor sensor system that gives results in just a few seconds to determine if you can drive. USB Rechargeable: The Alchol breathalyzer is easily charged with a USB cable, which can be charged through a mobile phone charger or a computer USB port. LED Display: Alchol Tester comes with an LED digital display. Green light - not drinking, yellow light - drinking, red light - drunk. The results are clear at a glance. Non-Contact Design: The Digital Breathalyzer uses a non-contact design, which is healthier and safer than direct entry testers. Your mouth can get results without touching the tester. Compact to Carry: The cohol Detector is small and lightweight, which is convenient to carry. You can keep it in your pocket or backpack. It can be used as a New Year's-gift and Christmas gift for family and friends. Specifications: Material:ABS Size:Approx.12.6x6.2x2.5cm/4.92x2.44x0.98inch Color:Black Detection range: 0~400mg/100ml. Inspection accuracy: 10% (100mg/ml) Display screen size: 1.44 inch TFT color screen Recovery time: 10s Preheating time: 10s Induction time: 5s Prompting function: when the alcohol content exceeds the standard, the color of the display screen is distinguished, and the buzzer automatically prompts. Power supply battery: 3.7V/800mAh rechargeable lithium-battery. Interface: USB Note: .Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. .Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings. Package includes: 1x Alcohol Breath Tester