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並前往https://support.polar.com/e_manuals/FT1_FT2/Polar_FT1_FT2_user_manual_English/ch02.html

2. GET STARTED | Polar FT1/FT2 User Manual | English

Activate/deactivate the target heart rate zone alarm in the Exercise mode. Press and hold the button until symbol appears/disappears.

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