Description: Non-Contact: direct blow to the tester, you can get the precise blood alcohol concentration in seconds. LED Display and Sound Effect: The test value is directly displayed on the LCD screen, the reading is convenient, accurate, intuitive, the result can be distinguished by sound (drunk alarm reminder) and light color. There are 2 units of measure to choose from,% BAC, g/l. Just press the power button for 2 seconds to start the tester, wait for 10 seconds for warming-up, then blow with the tester for seconds, the result will be ready within 5 seconds. USB Rechargeable: rechargeable design, built-in lithium battery, and long lasting, come with USB data cable. Exceeding standard alarm three-color detection indicator (Green, Orange, Red), clear at a glance whether one has drunk or not. Specification: Test Range: 0-0.1999% BAC Accuracy: ±0.005%BAC Reaction Time: within 5 Seconds Preheat Time: 10 Seconds Power Supply: USB Charging Port Breath Sampling: ≥5 Seconds Blowing Continus Size: Approx. 28x15.3x96.7mm/1.10x0.60x3.80inch Package Includes: 1 Piece Alcohol Tester 1 Piece USB Charging Cable 1 Piece Manual 1 Piece Package Box Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on-line shopping!