Name: High -precision portable alcohol tester Model: JCW-008 Current: 150mA Power: Type-C charging cable Size: 92mm X 26mm Measurement range: +/- 0.01%BAC Sensor: semiconductor sensor Response time: 20s 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 0.02% BAC, the green indicator light remains on. 5. When the detection result is or equal to 0.02% ABC and less than 0.05% BAC, the yellow indicator light remains on, the "Caution" on the screen flashes, and there is a slow beeping sound. 6. When the detection result is or equal to 0.05% BAC, the red indicator light remain on, and the "Danger" on the display screen flash, with a beep sound. The test results show a time of 10 seconds Colour:Black Material:plastic Package Contents: 1 x alcohol tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.