“I have an F7 and RS300, can I use the HR sensor strap with the M400?”

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• No must be Bluetooth

  Answered by Smccans 8 years ago

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• The heart rate strap that would have been sold with the F7 and RS300x would not be compatible with the M400. - Mike @ PolarUSA

  Answered by Polar Product Team 9 years ago

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