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The Polar WearLink + Transmitter Nike + (M-XXL) is an integrated chest strap and heart rate monitor designed to measure the user's heart rate. The WearLink + Transmitter Nike + sends data wirelessly to a compatible Nike + device via a 5 kHz coded transmission and to compatible gym equipment using the GymLink system. The strap is connected around the user's torso, just below the chest muscles. The WearLink + Transmitter Nike + will transmit heart rate data while swimming.
This M-XXL sized WearLink + Transmitter Nike + sensor fits chests measuring from 27 to 60".