Name: High -precision portable alcohol testerModel: JCW-008Current: 150mAPower: Type-C charging cableSize: 92mm X 26mmMeasurement range: +/- 0.01%BACSensor: semiconductor sensorResponse time: 20sHow to use an alcohol tester. Default shipment without battery1. Press the button for 1 second to power on, the backlight and display screen will 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 will sound, indicating that stage will 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 will sound to prompt for the result display. The detection results will 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 will remain on, and the "Danger" on the display screen will flash, with a sharp beep sound. The test results show a time of 10 secondsColour:BlackMaterial:plasticPackage Contents:1 x alcohol testerOnly 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.