Meet the Polar M430: a versatile running watch with wrist-based heart rate, GPS, and adaptive training guidance to help you become a better runner. The watch is waterproof and vibrates to let runners know when they have hit their goal.
The M430 relies on 6 LEDs for its optical heart rate monitoring. Pair it with Polar Flow to turn the watch into a running coach. The battery life lasts up to 30 hours.