Suunto Smart Heart Rate Belt 2 brings precision to serious training. Built for endurance athletes who train by intensity, it delivers accurate exercise heart rate and high-resolution beat-to-beat R-R interval data across road running, trail running, cycling, triathlon, and the winter and mountain sports where a wrist sensor struggles to hold skin contact.
ECG-based detection identifies QRS-complex artifacts in heart rate and R-R interval measurement, while a new chest-strap construction guards against ESD noise. The result is a heart rate trace that follows intervals, sustained surges and long efforts more consistently, and the quality of R-R data that ZoneSense needs to read intensity as it is on the day. ZoneSense requires a compatible Suunto watch.
A compact transmitter and a soft strap with silicone grip features keep the belt securely in place through long sessions, with less bulk on the chest and fewer adjustments along the way. Approximately 460 hours of battery life keep maintenance rare.
Paired with a compatible Suunto watch, a six-axis IMU adds running-form measurement, covering cadence, ground contact time, vertical oscillation, flight time, GCT/FT ratio and left/right ground-contact balance, so athletes can see how form changes with speed and fatigue. Up to 20 hours of rolling memory holds data on the belt, and a compatible Suunto watch reads it back by timestamp to keep the record continuous through a temporary signal interruption.
Smart Heart Rate Belt 2 connects to as many as three devices at once over a protected Bluetooth connection, sending the same live heart rate to a watch, a bike computer and a phone together. Running-form measurement and workout memory are available with compatible Suunto watches.
