1、The OBEST Keychain Breathalyzer is a fully functional breath alcohol tester with semi-conductor sensor,folding breath tube, and even optional mouthpieces
2、Effective Breath Capture - The innovative fold-out mouthpiece ensures only your breath goes into the breathalyzer, while ambient air, fumes, and other airborne
3、Ultra Compact Design,you can take the product everywhere and test yourself,friends,family,or anyone who is curious about their Blood Alcohol Content;Perfect as a Christmas Gift
4、Professional high accuracy, detection range: 0.00-0.20 BAC%; 0.00-2.00g/L;0.00-2.00BAC‰;0.00-1.00mg/L;0.00-200mg/100mL
5、Advanced flat surfaced alcohol sensor, high sensitivity. Rapid detect results, quick response and resume

The OBEST Keychain Breathalyzer is a revolutionary portable breathalyzer that takes size and portability to the next level. 
You can quickly and easily estimate your BAC, Blood Alcohol Content, by blowing through the mouthpiece for several seconds. 
Never before has a breathalyzer had accurate alcohol sensing technology in a design this small and affordable. 
The innovative folding mouthpiece pulls out during testing and slides back down during storage-it's that easy! 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. 

Package Content: 
1 x Breath Alcohol Tester 
3 x Mouthpieces 

Attention Please !! 
In order to get more reliable record as possible,there are some tips which need to pay more attention. 
1.It is recommended to wait 20 minutes after drinking before testing, because alcohol takes about 20 minutes into the blood from the digestive organs,and residual alcohol in the mouth takes time to dissipate. 
2.The distance should be at least 3 minutes between each test to get a more accurate result. 
3.Do not use benzene, gasoline and thinners cleaning product ingredients tester. 
4.Do not allow any liquid penetrated into the sensor.