Fangrui Product Details Name: High -precision Portable Alcohol Tester Model: Jcw-008 Current: 150ma Power: Type-c Charging Cable Size: 92mm X 26mm Measurement Range: +/- 0.bac Sensor: Semiconductor Sensor Response Time: 0s How To Use An Alcohol Tester. Default Shipment Without Battery 1. The Button For 1 Second To Power On, The Backlight And Display Screen Light Up At The Same Time, Displaying And Prompting To Turn On With A Beep Sound. 2. The Display Screen Displays And A 10 Second Countdown. After The Countdown Is Completed, A Beep Sound Sound, Indicating That Stage Be Entered At The Same Time. 3. The Display Screen Displays Blow And A 10 Second Countdown. Blow Air Into The Blowing Area For 3-5 Seconds. After The Countdown Is Completed, A Drip Sound Sound To Prompt For The Result Display. The Detection Results Be Displayed In Both% Bac And G/l. 4.when The Detection Result Is Less Than 0. Bac, The Green Indicator Light Remains On. 5. When The Detection Result Is Or Equal To 0. Abc And Less Than 0. Bac, The Yell