Switching the Backlight On
Press the Light button and the display is illuminated for a few seconds.
After you have illuminated the display once while exercising night mode symbol 
appears in the display. The display automatically illuminates each time you press any button or bring the wrist unit near the Polar logo on the transmitter, until you stop recording the exercise.
Switching Keylock 
On or Off
Press and hold the Light button to lock and unlock all the buttons, except the Light button. BUTTONS LOCKED or BUTTONS UNLOCKED is displayed.
Pausing the Exercise
You can pause your exercise recording while taking a break to drink water or some other activity.
1.Press the Back button. Your current heart rate is displayed. The recording of the exercise is paused. 
instead of 
is displayed.
2.Select CONTINUE by pressing the 
/ 
buttons. Press OK to continue recording your exercise.
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