Polar M430

Polar says the M430 is water resistant to 30 meters and suitable for bathing and swimming. Wrist-based heart-rate measurement may not work optimally in water, and Bluetooth chest-strap communication does not work underwater. [Polar](https://support.polar.com/en/support/m430)

Polar specifies up to 8 hours of continuous training with GPS and optical heart rate, or up to 30 hours when GPS power-saving mode is used. The watch has a 240 mAh rechargeable lithium-polymer battery. [Polar technical specifications](https://support.polar.com/e_manuals/M430/Polar_M430_user_manual_English/Content/technical-specifications.htm)

Polar positions the M430 as a GPS running watch with wrist-based heart rate, pace and distance tracking, although it can record other training profiles and be worn for swimming. Its official specification lists up to 60 hours of stored training with GPS and heart-rate data, so it is better understood as a running-focused multisport tracker than a dedicated triathlon model. [Polar](https://support.polar.com/en/support/m430)

Yes. The M430 uses Bluetooth Low Energy and syncs training data with Polar Flow on a compatible smartphone or computer. Polar also lists GPS distance accuracy of about plus or minus 2% in open satellite conditions. [Polar technical specifications](https://support.polar.com/e_manuals/M430/Polar_M430_user_manual_English/Content/technical-specifications.htm)