D2000 HD IPS Screen Portable Blow-Type High-Precision Alcohol Content Tester 1. Material: ABS 2. Size: 89x45x17mm 3. Charging port: Type-C 4. Small and simple, easy to carry 5. Removable air inlet nozzle, easy to clean and disinfect, safe and hygienic 6. Adopts precise air volume air path design, high-precision sensor, and test results in seconds 7. High-quality ABS shell, sturdy and wear-resistant, drop-resistant and dust-proof design, stable and reliable 8. Built-in graphene battery, super long battery life of 30 days, can be used for a long time 9. IPS high-definition digital display screen, read data at a glance, simple and clear How to use: 1. Press and hold the power button for 2 seconds to turn on. 2. Insert the mouthpiece into the reserved hole of the device. 3. Click the power button to enter the test interface, and the screen displays "Preparing". 4. The screen displays "Please blow" and a voice prompt appears. Please blow continuously for 3 seconds at the blowing port. After starting the blowing, there will be a vibration reminder. After blowing for 3 seconds, the vibration stops. If the blowing time is less than 3 seconds or interrupted in the middle, the device will prompt that the blowing is interrupted and needs to re-enter the blowing stage. 5. After the blowing is successful, the device enters the data analysis state. 6. After the data analysis is completed, the test results are announced by voice and displayed on the screen.