Garmin HRM Tri Heart Rate Transmitter and Strap
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Garmin HRM Tri Heart Rate Transmitter and Strap has a rating of 4.9 stars based on 7 reviews.

By Garmin

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Made specifically for triathletes, this is Garmin's smallest and lightest heart rate monitor available. The strap is easily adjustable and comfortable both in and out of water. When in water the transmitter stores heart rate information and forwards it to the 920XT, Fenix 3, and Epix when out of water.

Heart Rate Data in Three Disciplines

This 2.4 GHz ANT Wireless Heart Rate Transmitter and Strap is designed for Triathletes in mind. It is smaller than most other transmitters and comes with a comfortable adjustable strap. Its soft, rounded edges and covered seams make the strap super-comfortable out of the water, too.

Heart Rate Info
Supports heart rate variability and advanced heart rate features
ANT+ heart rate
Stores and forwards heart rate

Water rating 5 ATM
Stores up to 20 hours of heart rate data during swims, then forwards it to a compatible devices at the end of the session
Sends real-time heart rate to the watch when the monitor is out of the water
Swim interval heart rate statistics

In addition to standard heart rate metrics for every leg of the race, it provides running dynamics including cadence, vertical oscillation and ground contact time while running (using it with epic, fenix 3 and Forerunner 920XT).

Transmitter Unit Battery CR2032
Transmitter Unit Battery life Approx. 10 months when training 1 hour per day

A simple bi-fold adjustment reduces elastic weight and makes sizing easy.
Dimensions -
23.5 to 56.0 inches in length x 1.2 inches wide x 0.5 inches deep
60.0 to 142.0 cm in length x 3.0 cm wide x 1.2 cm deep

Weight -
2.1 oz
59 g

Transmitter Unit
Dimensions -
29.4 x 51.4 x 8.5 mm

1.7 oz
49 g

Garmin Connect Compatible
View a complete picture of your activities with Garmin Connect, the free online community where you can save, plan and share. Create workouts, training plans and goals to get the most out of your device. View detailed swim metrics including heart rate graphs, swim pace, stroke type, mapping and more. Instantly upload through the Garmin Connect Mobile app to share before you finish cooling down. Plus, follow your activity tracking stats, including daily steps, distance and calories burned


Physical Specifications

  • Unit dimensions (LxWxD): 23.5”-56.0” x 1.2” x 0.5” (60.0 - 142.0 x 3.0 x 1.2 cm)
  • Weight: 2.1 oz (59 g)
  • Module size: 29.4 x 51.4 x 8.5 mm
  • Module weight: 1.7 oz (49 g)
  • Size adjustment: Bi-fold
  • Sizing range: 23.5”-56.0” (60.0 - 142.0 cm)
  • Battery: CR2032
  • Battery life: 10 months (Tri training 1 hour per day)
  • Water rating: 5 ATM


  • ANT+® heart rate: yes
  • Supports heart rate variability and advanced heart rate features: yes
  • 2.4 GHz ANT wireless communication protocol: yes
  • Running dynamics: yes
  • Stores and forwards heart rate: yes
  • Swim interval heart rate statistics: yes
  • Non-slip design for pool swimming: no
  • Pool chemical resistant: no

HRM USA is dedicated to always offering the best value to our customers. We will match the price, at the time of purchase any product sold by an Authorized Dealer of that specific product offered at lower price. Proof of lower price is required.

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  • Price Match will take into consideration final value costs, including shipping and taxes.