This is a fully functional breath alcohol tester with an internal alcohol sensor and even optional mouthpieces.
 You can quickly and easily estimate your BAC, Blood Alcohol Content, by blowing through the mouthpiece. 
You can take the product everywhere and test yourself, friends, family, or anyone curious about their Blood Alcohol Content.
 Everyone will want to test themselves whether you’re at a party, bar, restaurant, or anywhere else alcohol is consumed. 
Learn how drinking alcohol affects your Blood Alcohol Content and always make smart, informed decisions.

Features:

Digital alcohol tester with audible alert
Range: 0.00-0.19 % Blood Alcohol Content
Quick response and resume
Washable Mouthpiece
Key Chain
Uses two (2) "AAA" batteries (not included)
Led Backlight
Fast and simple to use
 
What's Included:

One (1) Breathalyzer Alchohol Sensor Keychain with LCD Digital display and Alarm Clock
Four (4) Mouthpieces
Instruction Manual

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How to use the alcohol tester
Warm-up
1.  Press the power button once, and the alcohol tester LCD will turn on with one beep sound.
 
 
 
1.   The "warm-up" symbol is displayed, and the 10 to 00 countdown is started which indicates the tester is in warm-up mode.
Note
l       If the first warm-up is defeated, the tester will be reset automatically and warm up again 1-3 times.
l       It always has a large number of gas & impurity adsorbed on the surface of the alcohol tester, when the first time taking out the tester from the packaging, or after a long time no using the tester, it needs more time for cleaning and warms up the sensor, you should repress the power button and retry several times if possible.
Test
1.     The "Blow" symbol is displayed when warm-up is successful, and the 10 to 00 countdown is started to indicate the tester is in testing mode.
 
 
 
2        Near and blow into the breath inhaler for 3-5 seconds.
3.       Read the test result from the alcohol tester LCD.
4.      The "Caution" symbol is displayed if the alcohol concentration is the level:
          0.02% BAC (or 0.2g/l) to 0.05% BAC (or 0.5g/l)
          0.05% BAC (or 0.5g/l) to 0.08% BAC (or 0.8g/l)
 
 
 
5.     The "Danger" symbol is displayed with a beep audible alert if the alcohol concentration is the level:
         Over & equal 0.05% BAC (or 0.5g/l)
         Over & equal 0.08% BAC (or 0.5g/l)
Auto power off
After the result is displayed for about 10 seconds, the "OFF" symbol will appear for 2-3 seconds and the alcohol tester be turned off.
 
 
 
1.       If warm-off is defeated, the tester will automatically be turned off.
2.       If no blow into the breath inhaler within 10 seconds in testing mode, the alcohol tester will be turned off after the LCD the result "0.00% BAC & 0.0 g/l for about 10 seconds.
 
Note
* To obtain a more accurate result, the manufacturer recommends you to check repeatedly 2 or 3 times
 
Replace battery
The LCD flickering indicates low power of batteries, please replace two "AAA" alkaline batteries.
 
Specifications
* Sensor: advanced semiconductor oxide alcohol sensor
* Range: 0.00%-0.19% BAC (0.0-1.9g/l)
* Accuracy: 0.01% BAC (0.1g/l)
* Power input: 2×1.5V "AAA" alkaline battery
* Operating time: warm up: 10s, response: <5s
* Auto power off: 1 minute approx
* Dimension: 118×70×28mm
 
Precaution
-- When after drinking, it is recommended to last after 20 minutes, it is because 20 minutes is approximately for alcohol to be absorbed into the blood from the digestive organs, and residual alcohol remaining in the mouth takes this long to dissipate.
-- For accurate results, do not repeat the next testing within 3 minutes after the last time.
-- Do not smoke and eat for 20 minutes before testing.
-- Do not use chemicals to clean the tester directly.
-- Do not blow liquid into the breath pipe.
-- Do not use any excitant substances near the tester, such as paint, insecticides, or alcohol.
-- Do not place the tester in a closed environment with contaminated air.
-- The result of this alcohol gives BAC for reference only, the manufacturer does not take any legal responsibility.