POLAR S720i - Manual (Page 7)

A. GETTING GOING
A 5
The elastic strap holds
the transmitter
comfortably, yet firmly,
in the correct position.
The transmitter detects
your heart rate and
transmits it to the wrist
receiver.
The wrist receiver
displays your heart rate
and cycling data during
exercise. Enter your
personal settings into
the receiver
and analyse the exercise
files after you’re done.
Heart rate monitor
parts and their
functions