The device is a professional breathalyser. It can tell you if you are safe to drive after drinking.
It is small and easy to carry, and it contains 20 mouthpieces that you can use and clean.
To use the device, you need 2 AAA batteries (not included). Turn on the device, wait 10 seconds, and blow for 3-6 seconds. The result will show on the screen. The device will turn off after 10 seconds.
The device will beep if the result is too high. This means you should not drive. The limit is 0.05% BAC or 0.50‰ BAC or 0.25mg/L or 50mg/100ml.
Some tips for using the device: Test several times and take the average value. Wait 20 minutes after drinking before testing. Wait 3 minutes between each test.