POLAR S725 - Manual (Page 7)

A. GETTING GOING
A 5
The electrode areas of
the strap detect your
heart rate.
The connector transmits
your heart rate signal
to the wrist unit.
The wrist unit displays
your heart rate and
cycling data during
exercise. Enter your
personal settings into
the wrist unit
and analyze the exercise
files after you’re done.
Heart rate monitor
parts and their
functions