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 Package Includes: 1x Alcohol Breath Tester note: ①.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. ②.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.