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Polar - Introducing Polar OH1 optical heart rate sensor. Optimized for use on the lower or upper arm, Polar OH1 provides an alternative method for measuring your heart rate during training. In
Amazon.co.jp: POLAR 92083450 Polar Verity Sense Optical Heart Rate Sensor, Gray, Armband, Temple Measurement, Waterproof, Swimming, Bluetooth ANT+ Connection, Scandinavian, Genuine Japanese Product : Sports & Outdoors