Back to top


  • Strapless, continuous heart-rate monitoring breaks the mold with 2 light beams and an electro-optical cell in the case back that sense the volume of blood in your wrist
  • Signal from the electro-optical cell pulsates in sync with your heart; an advanced electronic circuit processes the signal and passes it to the embedded computer program
  • Separate motion sensor compensates for disruptions caused by arm movements that would otherwise interfere with the signal
  • User-settable heart rate zones feature 3-color visual alerts and audible alerts to keep you within your heart-rate target
  • Negative dot-matrix LCD screen provides continuous heart rate display
  • Data review includes total exercise time, average heart rate and time within your target zone; other features include a stopwatch and clock
  • Energy-efficient Bluetooth® Smart wireless transmitter works with popular exercise apps on iPhone 4s and newer to combine heart rate info with speed, distance and pace
  • Compatible apps include Endomondo, Wahoo Fitness, MapMyRun, MapMyRide, RunKeeper, Strava, miCoach and Mio GOiBike
  • Mio ALPHA Strapless Continuous Heart Rate Monitor features a silicone wristband with secure latch, USB charge dock with magnetic alignment and a rechargeable lithium battery
  • Battery life in exercise mode lasts 10 - 15 hrs.
  • Fits wrists 145-198mm / 5.7 - 7.8 in. in circumference


Note: The Mio ALPHA strapless continuous heart rate monitor resists water for use when swimming, but is not waterproof for diving. Large arm movements in cold water may affect the heart rate monitor's accuracy. Buttons should not be pressed while the unit is submerged. Wireless transmission does not work under water. After swimming, rinse the Mio ALPHA in cold water and dry with a soft cloth.

View all Mio Heart Rate Monitors

REI membership


Best Use Running, Cycling, Fitness
HRM Included/Integrated Yes
Heart Rate Sensor Type Wrist-based
Average Heart Rate Yes
Heart Rate Target Zone(s) Yes
Water-Resistant Depth 30 meters
Stopwatch Yes
Time Display Yes
Average Battery Life 10 - 15 hours
Gender Unisex
  • bvseo_sdk, java_sdk, bvseo-4.0.0
  • CLOUD, getReviews, 156ms
  • bvseo-msg: The resource to the URL or file is currently unavailable.;
  • bvseo_sdk, java_sdk, bvseo-4.0.0
  • CLOUD, getContent, 151ms
  • bvseo-msg: The resource to the URL or file is currently unavailable.;