SIGMA ONYX FIT - Manual (Page 44)

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2.4 MEASURING THE HEARTBEAT
Synchronisation of Watch and Chestbelt
Your ONYX FIT is equipped with a digitally coded chest belt that
enables you to have interference free training.
To activate your ONYX FIT hold down any button
for two seconds. The clock changes to active
mode and you enter the training main menu.
Note: At the start always refer to the tree
diagram shown in 2.1.
You can enter another word with up to
8 characters under the ONYX FIT font
(my name function). Please refer to
Chapter 3.2 “Setting unit”.