Zephyr HxM BT Wireless Heart Rate Sensor, Black


The Zephyr H x M BT is the first fitness-tracking device supported by both Android and Windows Phone 8 devices. It combines our Smart Fabric, heart rate sensor technology, movement sensors, and Bluetooth connectivity on a chest strap for athletes who live on the cutting edge of technology. Paired with the HxM, your phone can track exercise intensity level, speed, and distance while playing your music, tracking your GPS location, and providing calling services. Smart Fabric is conductive fabric that provides market-leading comfort and accuracy. It is woven onto a soft, elastic, adjustable (up to 40 inches) Machine Washable strap worn around the chest. The Bluetooth 2.0 module has 26-hour battery life per charge and is snap-detachable letting you recharge the H x M on the USB charger. It is covered by a 12-month limited warranty from defects and the strap itself is replaceable. The freedom to run: your phone, your app…no subscription fees. Why should you be tied to a device that only lets you use one app and charges you a subscription fee for the privilege? With an open communication design, the HxM provides unparalleled flexibility with the phones and applications you use. Supported by dozens of apps.

$ 69.95

Customer Reviews


102 of 105 people found the following review helpful
5.0 out of 5 stars
Buy this and you won’t be disappointed!, August 17, 2010
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This review is from: Zephyr HxM BT Wireless Heart Rate Sensor, Black (Health and Beauty)
The Zephyr HxM heart rate monitor is without a doubt, the best bang for my buck that I’ve found while looking for a HRM. While new to biking and just getting back into weight lifting, this is the first HRM that I’ve used, and while expensive, it provides seemless, live, heart rate information on my Droid. I get to track my biking route through the Droid’s GPS, as well as my avg and top speed, average and top BPM’s, and so on.

This little baby frees me up from having to keep track of multiple devices, and allows me to use one device to track all of my information needs, and provide a little musical entertainment while on those long bike rides.

It’s accurate (when compared to the manual method of checking your pulse for 15 seconds then multipying that by 4), extremely light weight, and the belt is extremely easy to clean (just pop the monitor itself off the belt and wash!)

My only complaint is that the device only comes with a USB charger. Not very handy if you’re on vacation and not near a laptop of computer. However, the monitor’s battery gives you approximately 23 hours of use on a single charge, and after having it now for almost four weeks, it still has the same charge that I put on it after opening up the box!

If you’re into exercising and want to know where your heart rate is for optimal weight loss and muscle development, AND own an Android OS based smartphone, I *HIGHLY* recommend this baby!

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68 of 73 people found the following review helpful
4.0 out of 5 stars
Great piece of kit!, July 25, 2010
By 
Matthew Lloyd (Cambridge, MA) – See all my reviews
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This review is from: Zephyr HxM BT Wireless Heart Rate Sensor, Black (Health and Beauty)
Everything about this heart rate monitor seems so perfect – from the soft comfortable fabric strap, the great battery life, the Bluetooth connectivity and range, to the compatibility with lots of great Android apps. I previously thought that the heart rate detection was inaccurate, because I found that it worked fine if you stay very still, but if you are moving around at all (e.g. using an elliptical, or jogging) the sensor will confuse the jogging motion for the heart rate. However, I have now found that I can solve that problem completely by prewetting the sensors with a little bit of water. I’m guessing this is a particular problem for me because I live in an air conditioned building, so my skin is usually very dry.

I’ve been analyzing the packets the device sends over Bluetooth, and have found out that, contrary to my previous belief, in addition to the average heart rate, the device transmits the actual RR intervals in milliseconds. This means that with the right software, the device could easily be used to analyze heart rate variability, and that you aren’t limited to the heart rate averaging algorithm that the device itself uses (which seems to be pretty solid anyway though).

I also love that they include a USB charging cradle. Much better than the Polar heart rate monitors with the expensive alkaline batteries that you have to replace every few weeks.

So in summary – a great piece of kit. My only ask is that Zephyr makes the API available publicly for free; I think that would boost developer adoption and we’d see a lot of Zephyr HxM apps on the market.

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67 of 73 people found the following review helpful
5.0 out of 5 stars
So much better than Polar for bluetooth reception, August 11, 2011
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This review is from: Zephyr HxM BT Wireless Heart Rate Sensor, Black (Health and Beauty)
I was having a lot of reception issues with my Polar heart rate monitor. I was about to give up on the whole Bluetooth concept with an HRM, but gave the Zephyr a try since it had some positive reviews here on Amazon. I’m really glad I did! After three weeks of use for backpacking in Acadia National Park, several hundred miles of cycling, and a fair amount of running, it’s performed better than I could have hoped. It is extremely accurate (I am very adept at doing manual heart-rate counts), has tremendous range (and has a nice long 20hr life. As others have mentioned, you have to charge it with a USB connection into a notebook or PC, but that’s not an issue for me. If it’s a problem for you, get a really cheap adapter. My phone came with one, and I have a ton more of them from other devices I’ve owned in the past.

The main issue I had with my Polar is that while cycling, I got terrible reception to my HTC Sensation when keeping the phone anywhere but directly in front of my body. Bluetooth is pretty infamous for having a terrible time broadcasting through the human body, and so I had basically assumed that Bluetooth would never work for the application I needed for most: cycling. I tried this one out, and was very surprised at how well it worked. Just how good? I had my friend carry my phone on a ride, and it never lost connection as we road over 20 miles on a trail–the whole time we were fairly close together, but at times were at least 10-15 feet apart with the phone in his bike’s rear carrier. That really impressed me. I’ve worn this riding home in the rain and never lost connection–again something my Polaris struggled with.

This is the best heart rate monitor I’ve ever owned, and I’ve owned quite a few the last 5 years. It’s the only one that Bluetooth works properly on in my opinion. It’s worth spending a bit more for this unit vs. the Polar for that very reason.

I use the Zephyr literally everyday with Endomondo fitness tracker (look me up if you use Endomondo–I use my real name there too) and it’s been flawless. As an aside, I’ve tried most of the fitness trainers like Cardio Tracker and iMapMyRun and Endomondo beats them hands down, at least with my phone. Highly recommend this HRM and Endomondo both.

Feel free to ask questions in the comments–I’ll do my best to answer them.

*****Update*****

After a month and a half of use (on a nearly daily basis), I am still extremely impressed with the Zephyr. It just works.

However, I did want to note that when I housed it in my 100oz Camelbak, it lost connection with the chest strap. Since bluetooth doesn’t transmit well through water, I guess I could have predicted that it would have problems. So if you plan to use the Zephyr, keep in mind it won’t broadcast through your Camelbak & your body both.

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