![background image](http://html1.mh-extra.com/html/conrad/speedmaster/speedmaster_operating-instructions-manual_2653981016.webp)
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11. Control elements of the heart rate monitor
"SET" button (A)
To start/stop the stopwatch or the countdown timer or to
change values
"LIGHT" button (B)
To activate the backlight
"SEL" button (C)
To take interval time (stopwatch function)
"MODE" button (D)
To switch between the individual functions