SUUNTO t4 - Manual (Page 12)

2.2. Activity class (act class)
Important: Your activity class is another one of the settings that you are asked to define when
you set up your device for the first time. Your activity class is a measure of your current activity
level. By entering your current activity class (1 - 10) into your Suunto t4, the device will be able to
give much more accurate calorie consumption information. As the amount and/or intensity of your
physical activity increases, the device will automatically increase your activity class based on your
recorded heart rate information. Your activity class will also be automatically decreased if, for ex-
ample, you engage in recreational sports. See the following table for information on determining
your activity class.
10