Get Smart - Your Phone, Your App, No Subscriptions - HxM Smart Heart Rate Monitor - iPhone 4s - iPhone 5 - Bluetooth Smart

Named the #3 best Health and Fitness Accessory has named the Zephyr HxM heart rate monitor the #3 best Health and Fitness Accessory for Smartphones. See their review here.

From the Leader in Physiological Monitoring

HxM Smart in package

Born from the HxM BT and the BioHarness, the HxM™ Smart gives you Heart Rate and R-R Interval with Bluetooth Smart (4.0) – allowing you to connect easily wth iPhone 5, iPhone 4s, iPod Nano and other Bluetooth Smart Ready devices.

Comfort for all-day performance

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. It is covered by a 12-month limited warranty from defects and the strap itself is replaceable.

Your phone, your app…no subscriptions!

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 apps including: Endomondo (iOS), Strava (iOS), SportsTracker, Runtastic, and more!


*Android Users should be sure if their app is compatible with the HxM Smart or HxM BT before buying. Visit our Apps page for details.

Workout smarter

Physiologists and fitness trainers recommend working out within certain heart rate zones to achieve goals such as weight loss or cardiovascular improvement. You no longer have to hold on to dirty handle bars on treadmills because the HxM continuously monitors you for faster feedback. With Zephyr, you can Measure Life…Anywhere!

Compatible with iPod Nano Compatible with iPod Touch Compatible with iPhone 4s Compatible with iPhone 5
Compatible with iPad 3rd Generation Compatible with iPad 4th Generation Compatible with iPad mini

 Bluetooth Smart


HxM Smart User Guide PDF pdf

Available at: Zephyr Webstore
International Customers  

Prices valid for U.S. Customers Only


  • Uses Bluetooth Smart (Low-Energy) to provide heart rate,  RR Interval to your iPhone 5, iPhone 4s
  • Machine Washable strap that offers both comfort and accuracy
  • Long transmission range (~10m)
  • Water Resistant up to 1m
  • Supported by dozens of Apps with no subscriptions required!
  • Works with iPhone 4S, iPhone 5, iPod touch (5th generation), iPad (3rd & 4th generation), iPad mini and iPod Nano (7th generation), Android 4.3 (where available)


  • Heart Rate
  • Heart Rate Variability
  • R-R Interval
  • Stress Level
  • Activity Level
  • Peak Accel.
  • Calories

*Not all apps will display every measurement the HxM Smart supports. Check with your app for details on what they display.


HR Range: 25 – 240 BPM
Battery Type: CR2032
Transmit Range: 10m
Frequency: 2.4 – 2.4835GHz
Garment Washes: 50
Operating Limits:  
     Temperature: -10 – 50°C
     Humidity: 5 – 95%

For Developers

Download the HxM Smart SDK

HxM Smart uses standard Bluetooth Low Energy Heart Rate monitoring profiles. Compatible hardware required (iPhone 4s (Bluetooth 4.0), iPhone 5, et al) . For custom packet support which includes RR, activity, peak acceleration, over the air firmware update capability, and more, the SDK has supporting documentation to unlock the full potential of the HxM Smart.

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