Our smallest and lightest module fits within the width of the strap. Its soft, rounded edges and covered seams make the strap super-comfortable out of the water, too.

Running Dynamics
HRM-Tri also has an accelerometer in the module that measures torso movement to calculate 3 different running metrics:

Cadence
The number of steps per minute. It displays the total steps (right and left combined).

Vertical Oscillation
The bounce in your running motion. It displays the vertical motion of your torso (measured in centimetres). HRM-Tri is compatible with several other fitness products but will only display heart rate when paired.

Ground Contact Time
The amount of time in each step that your foot spends on the ground while running (measured in milliseconds).

Specifications
Unit dimensions (LxWxD): 142cm x 3cm x 1.2cm
Weight: 59 g
Size adjustment: Bi-fold Sizing 60cm-142cm
Battery: CR2032
Battery life: 10 months (Tri training 1 hour per day)
Water rating: 5 ATM

Compatible Devices
Garmin’s HRM-Tri Heart Rate Strap comes with compatibility with a huge range of Garmin devices. This includes:
Fenix 5
Fenix 5 Plus
Fenix 5S
Fenix 5S Plus
Fenix 5X
Forerunner 735XT
Forerunner 935
VIRB 360