Cal. No. W770
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Protraction of connection time - "Light Level" screen
The time can be extended if you used the watch with making it generate power well.
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The maximum connection time is 6 hours when purchasing the watch.
Extension amount may increase up to 6 hours at 2-hour increments depending on power generation amount and the total connection time can be extended to 8, 10, or 12 hours.
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Connection time return to 6 hours when power generation amount becomes insufficient.
You can see the condition of power generation of the watch in the "Month" of "Light Level" screen of the app.
On this screen, the power generation amount of the previous week (part surrounded by green dots) surpasses the line of "+2" (orange line) and the total connection time can be expanded up to 8 hours.
Touch the "+2" icon in white (pointed by the red arrow) to extend connection time.