Yes, Suunto Smart Sensors and other Bluetooth compatible HR belts can be used with Suunto Spartan Trainer Wrist HR.
See chapter Pairing PODs and sensors in the User Guide for instructions on how to pair an HR sensor with your watch.
How to start an exercise with a HR belt:
Please note that the HR belt needs to be active before entering the Exercise screen, so that the watch uses it as source for HR data instead of the wrist HR.
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