Feature:1. Portable and Compact: The alcohol tester has a portable design, which can be kept with your keyring, handbag, purse or belt hook2. Backlight Design: The digital alcohol tester has a backlight design, which helps you see the readings clearly3. Easy to Use: The portable alcohol tester is easy to use, which is used directly, and the settings are not complicated4. ABS Material: The battery powered alcohol tester is made of ABS material, which is wear resistant and durable, and has a long service life5. Pay Attention: When you take the tester out of the package for the first time or do not use the tester for a long time, there is always a lot of gas and impurities on the appearance of the alcohol sensor. You should press the power button and try again several timesSpecification:Item Type: Alcohol TesterMaterial: ABSBattery Type: 2 x AAA Batteries (need to bring your own) (delivery without batteries)How to Use:Install the battery1. Slide open the battery compartment cover from the back of the battery.2. Insert two AA batteries with correct polarity.3. Close the battery compartment cover.How to Warm Up with a Alcohol Tester1. Press and hold the power button to turn on the alcohol tester. The yellow and red LEDs will light up to indicate readiness.2. Press and hold the power button until the green LED lights up and the warm‑up is complete.3. Please press and hold the power button until the entire test is completed.Alcohol test:1. After the warm up is successful, wait for 3 to 5 seconds. Then forcefully enter the breathing inhaler for 3 to 5 seconds.2. View the test results.3. Release the power button after the test.4. For more accurate results, repeat the check 2 to 3 times.Package List:1 x Alcohol Tester 1 x User ManualNote:The warm up time is about 0 to 15 seconds, which is optional according to the sensor status or environment.