Description:      Quickly estimate your blood alcohol concentration with this small and contactless alcohol breathalyzer. No need to worry about forget to install a mouthpiece or hygiene issue, you can directly blow to the tester inhaler without a mouthpiece, more convenient and safe. Easily carry it with you, testing your BAC at any time and anywhere.        How to Use:     1. Press and hold the power button for 1 second, the alcohol tester LCD with turn on with one beep sound.     2. Warm-up mode countdown for 10 seconds.     3. Testing mode countdown from 10 to 00 after warm-up mode, blow at this period.     4. Blow into the breath inhaler for 3-5 seconds with normal power after a deep inhalation.     5. Read the test result from the alcohol tester LCD.     6. Test range: 0.00%-0.19% BAC & 0.0-1.9 g/L.        Specifications:      Name: AT05 Push Cover Type Alcohol Tester (Built-in Battery) (Boxed)     Material: ABS + electronic components     Color: black/silver     Size: about 18*8*4cm/7.09*3.15*1.57inch        Packing List:      1 * Box     1 * Instructions     1 * USB Data Cable     1 * Alcohol Tester