--- product_id: 1114862 title: "Keychain Breathalyzer | Portable BAC Alcohol Tester | Black | 3 Mouthpieces Included | For Home & Personal Use" price: "¥14002" currency: JPY in_stock: true reviews_count: 8 url: https://www.desertcart.jp/products/1114862-keychain-breathalyzer-portable-bac-alcohol-tester-black-3-mouthpieces-included store_origin: JP region: Japan --- # Compact keychain size Seconds to BAC result One-year warranty Keychain Breathalyzer | Portable BAC Alcohol Tester | Black | 3 Mouthpieces Included | For Home & Personal Use **Price:** ¥14002 **Availability:** ✅ In Stock ## Summary > 🔍 Know Before You Go — Stay Smart, Stay Safe! ## Quick Answers - **What is this?** Keychain Breathalyzer | Portable BAC Alcohol Tester | Black | 3 Mouthpieces Included | For Home & Personal Use - **How much does it cost?** ¥14002 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/1114862-keychain-breathalyzer-portable-bac-alcohol-tester-black-3-mouthpieces-included) ## Best For - Customers looking for quality international products ## Why This Product - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Hygienic & Precise:** Innovative fold-out mouthpiece ensures optimal breath capture, filtering out airborne pollutants for reliable readings. - • **Instant BAC Readings:** Get accurate blood alcohol content results in seconds with Advanced MicroCheck Sensor technology. - • **Pocket-Sized Convenience:** Ultra-portable design fits effortlessly on your keychain or in your pocket—always ready when you need it. - • **Trusted Durability & Support:** Backed by a one-year warranty and designed with quality assurance in California for peace of mind. - • **Effortless One-Button Operation:** Simple, intuitive testing with a single button—no complicated setup or waiting around. ## Overview The BACtrack Keychain Breathalyzer is a sleek, portable device that delivers fast and reliable blood alcohol content readings using proprietary MicroCheck Sensor technology. Designed for ease of use with one-button operation and a fold-out mouthpiece, it fits conveniently on your keychain for on-the-go testing. With a one-year warranty and quality assurance from California-based design, it’s the perfect companion for responsible professionals who want to stay in control and avoid risky decisions. ## Description Buy BACtrack Keychain Breathalyzer | Portable BAC Alcohol Tester | Black | 3 Mouthpieces Included | For Home & Personal Use on desertcart.com ✓ FREE SHIPPING on qualified orders Review: Easy to Use, Seems Accurate - Lasted Over Five Years - This is an update to my original review from over five years ago. My unit lasted for over 5.5 years before it would display only '0.0' during a test. Everything else worked so I assume the sensor finally wore out and/or it needed a factory calibration. (Note: BACtrack recommends periodic factory calibrations, but at $19.99/each it's simply not worth it for a $25 unit.) The BACtrack Keychain was definitely a cost-effective, reasonably-accurate solution for me at the time. But in the interest of greater accuracy and lifecycle costs, I decided to replace it with a more expensive, more accurate self-calibrating unit with a user-replaceable sensor. That said, I still give it a five star rating based on my overall five year experience. I first saw this device in a comparison test of breathalyzers in the April 2014 issue of 'Car and Driver' magazine. It tested as well as - in some cases better than - a unit costing 5x more. The device feels well-made for the price - not especially rugged but not cheap either. It operated as-described. It comes with a Duracell AAA battery as pictured. The instruction manual is clearly written and the table describing effects of increasing levels of alcohol was informative. I have no way of verifying the unit's accuracy but it seems to work properly, displaying roughly proportionate increases in BAC when consuming alcohol. After 15 hours with no alcohol it registered a BAC of 0.00. After one shot and a fifteen minute wait it indicated 0.03. After an additional 3/4 bottle of beer and fifteen minute wait I tested at 0.04. In the FAQs, when queried where the unit was made, BACTRack customer service responded, "We do all our design, testing, calibration and quality assurance here in California" but for whatever reason omitted that it is also "Assembled in China" as printed on the packaging. Overall I recommend this device: it feel adequately constructed for the price, seems to work as advertised. I can see it being fun at parties and could save your license! Review: The BACTrack is a great product for what it is- a small device that ... - The BACTrack is a great product for what it is- a small device that gives you an idea, or perhaps a means to gauge your level of intoxication. I find that it's best case usage scenario is to follow the instructions to the letter - i.e. don't eat/drink, consume alcohol, or smoke for 20 minutes or more before testing yourself. Wait an additional 20 minutes and test again. The second test is to determine if alcohol is still metabolizing in your body, due to the way it is absorbed by the body. Using the BACTrack in this manner allows me to gauge whether my blood-alcohol-concentration is rising or falling. As far as accuracy goes, it's no fuel cell-based breathalyzer employed by law enforcement, but it also wasn't $150 or more and doesn't require weekly calibration. Sensors and technology have come a long way in the last 20 years and there has been a market for these types of devices. I seem to recall multiple DUI offenders having breathalyzers installed in their vehicles as part of their sentence, in which a sensor similar to the one in this BACTrack would gauge their BAC and allow/deny operation of the vehicle. While the BACTrack explicitly says the device cannot be used as evidence in court, I believe what the device is really great for is to serve as a reminder of one's civil etiquette. Your responsibility to operate a motor vehicle safely, and discourage you from getting behind the wheel of your tank because now you're aware that you're a bit plowed. This is my second BACTrack and it works just as well as the previous one I owned, which was stolen by a friend during a long day of inebriation. He still uses it and hasn't had to calibrate it yet. I'm curious to have mine calibrated, but the instructions state it only needs to be calibrated every 6 months with light use. Perhaps I need to step up my game.. ## Features - QUICKLY & EASILY ESTIMATE YOUR BAC - Proprietary Advanced MicroCheck Sensor technology delivers results in seconds. - EASY TO USE - One-button operation means you simply power on your breathalyzer keychain and begin testing your blood alcohol content in seconds. It's that easy! - SMALL & PORTABLE DESIGN - This mini handheld breathalyzer measures fits easily in a purse, pocket, or on your keychain, so you can always have it when you need it. - OPTIMAL BREATH CAPTURE - The innovative fold-out mouthpiece ensures only your breath goes into the alcohol tester, while other airborne pollutants are kept out. - ONE-YEAR WARRANTY - If your BACtrack Keychain ceases to function properly during the first year of operation, we will repair or replace the defective device. ## Technical Specifications | Specification | Value | |---------------|-------| | Best Sellers Rank | #53,630 in Health & Household ( See Top 100 in Health & Household ) #12 in Personal Breathalyzers #3,495 in Sales & Deals | | Customer Reviews | 3.9 out of 5 stars 4,938 Reviews | ## Product Details - **Brand:** BACtrack - **Item Weight:** 3.2 Ounces - **Item dimensions L x W x H:** 1.45 x 0.55 x 2.44 inches - **Style:** Minimalist Utility - **UPC:** 850167002672 132017753195 069060190106 069060197792 850167002634 885280057803 ## Images ![Keychain Breathalyzer | Portable BAC Alcohol Tester | Black | 3 Mouthpieces Included | For Home & Personal Use - Image 1](https://m.media-amazon.com/images/I/611IZaa-EDL.jpg) ## Available Options This product comes in different **Color, Item Package Quantity** options. ## Questions & Answers **Q: How accurate are BACtrack breathalyzers?** A: BACtrack uses carefully-engineered technology to deliver reliable, consistent BAC results, with unparalleled accuracy. Several independent agencies have tested popular personal breathalyzer brands and found BACtrack to be the most accurate. **Q: How often do BACtrack breathalyzers need to be calibrated?** A: Our general recommendation is to have your BACtrack calibrated every 12 months, but it really depends on how your BACtrack is performing. With proper care and usage, we've seen that our devices can go for 1000's of tests before needing calibration. **Q: Where are BACtrack breathalyzers made?** A: Our breathalyzers are designed by our team of talented engineers at our San Francisco headquarters and manufactured in our overseas facilities. We aim to provide the most accurate, innovative, reliable & affordable alcohol testers on the market. **Q: What should I do if I'm having issues with my BACtrack breathalyzer?** A: In the rare instance where you are having trouble with your BACtrack, please send a message to our US-based customer success team directly from your Amazon orders page and they'll be happy to help you troubleshoot. **Q: Am I able to return my BACtrack breathalyzer if it stops working?** A: Yes, if your BACtrack ceases to function properly during the first year of operation, we will repair or replace the defective product at no additional charge to you. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Easy to Use, Seems Accurate - Lasted Over Five Years *by G***H on March 10, 2014* This is an update to my original review from over five years ago. My unit lasted for over 5.5 years before it would display only '0.0' during a test. Everything else worked so I assume the sensor finally wore out and/or it needed a factory calibration. (Note: BACtrack recommends periodic factory calibrations, but at $19.99/each it's simply not worth it for a $25 unit.) The BACtrack Keychain was definitely a cost-effective, reasonably-accurate solution for me at the time. But in the interest of greater accuracy and lifecycle costs, I decided to replace it with a more expensive, more accurate self-calibrating unit with a user-replaceable sensor. That said, I still give it a five star rating based on my overall five year experience. I first saw this device in a comparison test of breathalyzers in the April 2014 issue of 'Car and Driver' magazine. It tested as well as - in some cases better than - a unit costing 5x more. The device feels well-made for the price - not especially rugged but not cheap either. It operated as-described. It comes with a Duracell AAA battery as pictured. The instruction manual is clearly written and the table describing effects of increasing levels of alcohol was informative. I have no way of verifying the unit's accuracy but it seems to work properly, displaying roughly proportionate increases in BAC when consuming alcohol. After 15 hours with no alcohol it registered a BAC of 0.00. After one shot and a fifteen minute wait it indicated 0.03. After an additional 3/4 bottle of beer and fifteen minute wait I tested at 0.04. In the FAQs, when queried where the unit was made, BACTRack customer service responded, "We do all our design, testing, calibration and quality assurance here in California" but for whatever reason omitted that it is also "Assembled in China" as printed on the packaging. Overall I recommend this device: it feel adequately constructed for the price, seems to work as advertised. I can see it being fun at parties and could save your license! ### ⭐⭐⭐⭐⭐ The BACTrack is a great product for what it is- a small device that ... *by G***T on May 17, 2017* The BACTrack is a great product for what it is- a small device that gives you an idea, or perhaps a means to gauge your level of intoxication. I find that it's best case usage scenario is to follow the instructions to the letter - i.e. don't eat/drink, consume alcohol, or smoke for 20 minutes or more before testing yourself. Wait an additional 20 minutes and test again. The second test is to determine if alcohol is still metabolizing in your body, due to the way it is absorbed by the body. Using the BACTrack in this manner allows me to gauge whether my blood-alcohol-concentration is rising or falling. As far as accuracy goes, it's no fuel cell-based breathalyzer employed by law enforcement, but it also wasn't $150 or more and doesn't require weekly calibration. Sensors and technology have come a long way in the last 20 years and there has been a market for these types of devices. I seem to recall multiple DUI offenders having breathalyzers installed in their vehicles as part of their sentence, in which a sensor similar to the one in this BACTrack would gauge their BAC and allow/deny operation of the vehicle. While the BACTrack explicitly says the device cannot be used as evidence in court, I believe what the device is really great for is to serve as a reminder of one's civil etiquette. Your responsibility to operate a motor vehicle safely, and discourage you from getting behind the wheel of your tank because now you're aware that you're a bit plowed. This is my second BACTrack and it works just as well as the previous one I owned, which was stolen by a friend during a long day of inebriation. He still uses it and hasn't had to calibrate it yet. I'm curious to have mine calibrated, but the instructions state it only needs to be calibrated every 6 months with light use. Perhaps I need to step up my game.. ### ⭐⭐⭐⭐ Great Tool -- Troubleshooting: REPLACE BATTERY *by J***Y on July 25, 2013* 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: RELIABILITY: 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. ACCURACY: I've never been able to measure and track the phenomenon of BAC, so I had no idea what to expect. I looked at a table of BAC's, drink units, and body weight/height to see what a standard drink should do to me. I did a proper test, where I had 1 drink unit (1 12oz can of beer in this case) and waited 20min to do a test. It matched the table perfectly. And it's very consistent. If I repeat a test, it is always within 0.01 of the last. You don't necessarily have to wait the full 20 minutes, but there are caveats. If you are still absorbing alcohol in your GI tract, yet have absorbed all of it in your mouth and throat (you ate a big meal before drinking), the reading will be low because you haven't absorbed everything into your system yet (it will continue to rise even if you don't have another drink). If you're still absorbing alcohol in your mouth (ie. after a sip of hard liquor), it will read high because the alcohol takes longer to absorb through your mouth and throat. You can rinse your mouth and do a test to get a ROUGH idea anytime, but if you want to be sure about your reading, wait 20 minutes. If 20 minutes isn't possible and it's important, your environment isn't healthy. CALIBRATION: The official website says that it should be sent for calibration after 6mo - 1yr. Closer reading of the manual confirms what many professionals in the BAC field will say: Every Month. The manual states that under 'average' use, it will need to be calibrated after 6mo - 1yr. But under daily use, it may need calibration as often as once a month. I will periodically see what it reads my BAC 20 min after 1 standard drink, and send it off when it looks inconsistent or off. CONCLUSION: BAC was a much simpler concept in my head until I started reading and got this doodad. You have to learn a little science to understand what is going on. But it will help you understand that "feeling OK" is often not good enough. Really, this tool is most useful if you understand how alcohol interacts with your body. Breathalyzers are not a surefire or definitive way to measure 'drunkenness' because they are an indirect measurement that can be affected by many factors. However, if you would like a tool to give you a rough idea of what you can handle, and have the knowledge to understand what factors are at play, it's a damned educational gadget that I would recommend to anyone interested in some learnin'. At $30, it's a great deal. If you need more accuracy, or whatever, spend the money for a fuel-cell breathalyzer and get it calibrated every month. The BACtrack keychain is a good "back of the envelope" tool that can be very educational. ## Frequently Bought Together - BACtrack Keychain Breathalyzer (Black) | Ultra-Portable Pocket Keyring Alcohol r for Personal Use - BACtrack Keychain Breathalyzer Mouthpieces (20 Count) | Compatible with BACtrack Keychain, Go, Vio and T60 Breath Alcohol Testers | Not Compatible with BACtrack C6 and C8 Breathalyzers --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.jp/products/1114862-keychain-breathalyzer-portable-bac-alcohol-tester-black-3-mouthpieces-included](https://www.desertcart.jp/products/1114862-keychain-breathalyzer-portable-bac-alcohol-tester-black-3-mouthpieces-included) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-09-02*