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BACtrack Mouthpieces Buy extra replacement mouthpieces for this model BACtrack Breathalyzer Learn more

BACtrack Keychain Breathalyzer Portable Keyring Breath Alcohol Tester, Black

from BACtrack
681 customer reviews
| 11 answered questions
About the Product
  • Advanced MicroCheck Sensor Technology - BACtrack's proprietary sensor technology delivers reliable, accurate BAC results you can trust.
  • Ultra-Compact Design - Fits inside a purse or pocket and can be easily used as a keychain
  • Effective Breath Capture - The innovative fold-out mouthpiece ensures only your breath goes into the breathalyzer, while ambient air, fumes, and other airborne gases are kept out.
  • One Touch Operation - Simply power on your BACtrack Keychain and BAC results are displayed on a bright, easy-to-read LCD display in seconds
  • Manufactured by BACtrack - The #1 most-trusted brand of breathalyzers, with over 14 years of experience providing the most accurate, convenient and affordable breath alcohol testing devices on the market

Frequently Bought Together

  • BACtrack Keychain Breathalyzer Portable Keyring Breath Alcohol Tester, Black
  • +
  • BACtrack Keychain Breathalyzer Mouthpieces (Pack of 10)
  • +
  • BACtrack Go Keychain Breathalyzer, Portable Keyring Breath Alcohol Tester, White
Total price: $47.90
Buy the selected items together

Product Description

Color: Black

The BACtrack Keychain Breathalyzer is a revolutionary portable breathalyzer that takes size and portability to the next level. The BACtrack Keychain Breathalyzer is a fully functional breath alcohol tester with an internal alcohol sensor, folding breath tube, and even optional mouthpieces. You can quickly and easily estimate your BAC, Blood Alcohol Content, by blowing through the mouthpiece for 5 seconds. Never before has a breathalyzer had accurate alcohol sensing technology in a design this small and affordable. You can take the product everywhere and test yourself, friends, family, or anyone who is curious about their Blood Alcohol Content. 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. And you can trust the BACtrack Keychain Breathalyzer because of BACtrack’s history and experience with personal and professional alcohol breathalyzers.

Product Details

Color: Black
  • Product Dimensions: 1.4 x 0.6 x 2.4 inches ; 3.2 ounces
  • Shipping Weight: 6.4 ounces (View shipping rates and policies)
  • Domestic Shipping: Currently, item can be shipped only within the U.S. and to APO/FPO addresses. For APO/FPO shipments, please check with the manufacturer regarding warranty and support issues.
  • International Shipping: This item can be shipped to select countries outside of the U.S. Learn More
  • Origin: China
  • ASIN: B006536ZXC
  • UPC: 163121146658 182682377448 132017753195 030955348186 792838866711 850167002634 031113253908 523161409258 097914414504 885754026120 044113369555 069060190106 069060197792 012303856529 885280057803 012303858875 956262297712 053786356632 088020572011 088022108379 885554526882 070321928505 168141305597 850167002672 580098565419 700621479031 698798649749 044111636635
  • Item model number: BT-KC10
  • Batteries 1 AAA batteries required. (included)
  • Average Customer Review: 3.7 out of 5 stars  See all reviews (681 customer reviews)
  • Amazon Best Sellers Rank: #425 in Health & Personal Care (See Top 100 in Health & Personal Care)
  • Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

From the Manufacturer

BACtrack Mobile Smartphone Breathalyzer BACtrack Vio Smartphone Keychain Breathalyzer BACtrack S80 Professional Breathalyzer BACtrack Trace Professional Breathalyzer BACtrack S35 Personal Breathalyzer BACtrack Keychain Breathalyzer
Ideal Use Personal & Professional Personal Personal & Professional PersonalPersonal & Professional Personal Personal
Sensor Type Fuel Cell Fuel Cell Fuel Cell Fuel Cell Semiconductor Semiconductor
Accuracy Rating 10 - Most Accurate 7 - Very Accurate 10 - Most Accurate 9 - Extremely Accurate 7 - Very Accurate 6 - Accurate
LCD Screen
Bluetooth Connectivity
ZeroLine - Estimates time to 0.000% BAC
Battery Type Mini-USB Rechargeable Lithium Ion 1 x AAA battery 2 x AA batteries 2 x AAA batteries 2 x AAA batteries 1 x AAA battery
One Year Warranty

Important Information

Legal Disclaimer
Actual product packaging and materials may contain more and different information than what is shown on our website. We recommend that you do not rely solely on the information presented and that you always read labels, warnings, and directions before using or consuming a product. Please see our full disclaimer below.

Customer Reviews

Most Helpful Customer Reviews

393 of 412 people found the following review helpful By Matias on July 25, 2013
Color: Black Verified Purchase
The Keychain Breathalyzer is really a great value, but like any measuring device, you HAVE to understand a little science and how to properly use it.

When I first got this little doodad, I put the battery in and went hog playing around with it, drinking with some buddies.

The next day, it started acting really funny. It would turn on and start counting down, and then shut off almost immediately. If I left it alone for several hours, I could do a test, but then it was unable to do another test. Sometimes I could do a test and it gave me the 'Lo' message. I thought the battery was dead. I checked the battery with a volt meter, and the battery didn't look dead at all. I thought I got a lemon... and then I got a new battery. Now it's fine.

To those who have seen the "it was working great the first night, and then it quit on me" reviews, this is what's going on:


This device seems power hungry, and I have a feeling that the AAA battery can't immediately produce the power it needs, so it needs to harvest the energy slowly while not in use so that it can do a test. I didn't like that this behavior isn't explicitly explained in the manual. The manual does say to wait a few minutes between tests. If you don't follow this, it will actually kill the battery. If you played with it non-stop all night and it won't work anymore on a seemingly good battery, replace the battery and use it properly. It will function perfectly. This is something that should be clearly addressed in the manual, and I think would eliminate the negative reviews that I have seen.

Realize, this device was designed for a responsible drinker who wants to stay safe. That person will use it perhaps 4 times at most throughout an evening.
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260 of 284 people found the following review helpful By Rob on March 31, 2012
Color: Black Verified Purchase
This thing is quite a battery hog (AAA size). Had an alocohol sensor unit that cost more and was more accurate than this one for a decade before it quit working. This one registered a 0.01 after a beer a few nights back- seems to work so far. Don't drink that much nowadays but I want to know just where I stand... One can get into serious trouble (prison) if he hurts/kills someone while driving impaired.

Will update this after I compare it to the BACtrack S80 fuel cell model that I recently ordered arrives.

Update: Drank two beers 24 oz. total. Here are the results as my body eliminated the alcohol. Three digit numbers on the left are the pricy fuel cell model results.

6:56pm .029 vs. .06 BAC
7:12pm .022 vs. .04
7:21pm .020 vs. .03
7:38pm .016 vs. .03
8:36pm .000 vs. .00

The two digit numbers on the right are this inexpensive keychain model. The three digit numbers on the left are the BACtrack S80 $136. model. My stomach was completely empty when I did the above comparison. My old alcohol sensor unit was more accurate than this one. This is little more than a keychain trinket/party toy as far as I am concerned.

Blew into a fuel cell model years back when a cop thought I was drunk. He was puzzled for I was well below 0.08 but had alocohol on my breath... Am glad I have an accurate breathlizer now. Cheap insurance considering the potential ramifications of being over 0.08% BAC. Figure on the high probability of a blood test for any and all drugs if you look/smell/act impaired. The courts have upheld the use of blood tests at the discretion of the cops. In the event of a fatal accident, your blood will be tested.

Went partying yesterday afternoon. Got two back to back readings with my S80 model of 0.
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106 of 119 people found the following review helpful By Colin B. on May 13, 2013
Color: Black
I bought this at the same time as another unit which was nearly twice the price in order to have multiple data sources in order to make an informed decision about my (lack of) sobriety.

When used correctly, it registers consistently exactly 0.01 below my other unit. I don't know which is "correct", but with mathematical computations based on my body weight vs. number of fluid ounces of alchohol, both register either exactly or very close to what they are supposed to. When I say "correctly", I mean not within 15 minutes of having a drink, or no repeated blows too close together (as the directions clearly state and clearly what multiple reviewers chose to ignore.)

I had one isolated incident where it read 0.00 a couple of consecutive times, but setting it down for 10 minutes and trying again seemed to correct it's minor brain lapse.

The real negative here is that the battery is seemingly only good for a few days (with our use, maybe 10-12 blows.) I would love for other users (or the manufacturer) to chime in and let me know if this is a defective unit, or truly a design deficiency, because this would be a 5-star product without this issue. Regrettably with it, it's only 3.


After publishing this review, I mailed bactrack customer service. They responded within about 4 business hours of my request with this very nice reply - upping my rating to 4 stars, and will change to 5 if the new one gets the proper battery life:


Thank you for contacting us with your Customer Support issue. I'm sorry to hear that you are having a little trouble with your breathalyzer.

According to manufacturer specifications and general customer experience, the KC10 typically has a battery life of about 50-75 uses.
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BACtrack Keychain Breathalyzer Portable Keyring Breath Alcohol Tester, Black
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