Features: *1. Portable Breath Tester - Cordless alcohol tester is rechargeable, compact, lightweight, you can carry it with you, with key chain. *2. Accurate Read - The newly upgraded portable alcohol tester uses advanced aviation-grade semiconductor materials and a new C+ language calculation method to make the test results more accurate and reliable. The test results of the 2 units are clearer. *3. Easy-to-read LED Display - Sound Color warning, 1) when Lower than the warning value, A beep sounds and the light turns green; 2) when Between the warning value and the dangerous value, A beep sounds and the indicator light turns yellow; 3) when Above the dangerous value, beep for about 10 seconds and indicator light turns red. Note: please wait another 10 minutes before starting the next test to obtain accurate test results. *4. Widely Used - For personal use ONLY, ideal for family gatherings, dating and friends gatherings. *5. How to Use - Press and hold the power button for 2 seconds to start the alcohol tester, Wait for 15 seconds to warm up, and then blow with the tester for 10 seconds. The result will be displayed after 3 seconds and the result will be displayed on the LCD screen. Display for 10 seconds. Product Material: ABS. Product Size: 8.3*22 cm. Package Includes: 1 x Alcohol Tester 1 x Charging Cable 1 x Manual