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Sigma STS R1 Zender Smart with Comfortex Heart Rate Monitor Ant+ / Bluetooth

Sigma STS R1 Zender Smart with Comfortex Heart Rate Monitor Ant+ / Bluetooth

Experience precise heart‑rate tracking with the Sigma STS R1 Zender Smart, featuring a lightweight Comfortex chest strap that delivers clear ANT+ and Bluetooth signals for seamless data sync to any compatible device.

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