Denver BFG-550 Guide D'utilisation page 11

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Toggle GPS
Long press the function key, you can turn on or off the watch GPS.
Reset
Long press the function key, you can reset your watch.
Gesture control
You can set the gesture control style on the App to turn on the
watch screen.
 Raising hand: while raising your hand, the screen is turned on.
 Turning wrist: while turning your wrist toward you, the screen
is turned on.
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