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Smartwatches may seem like a novelty but they're essential information from your phone to your wrist

A fine line between fitness bands and smartwatches

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Poor battery life compared to LCD displays OLED or AMOLED

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The best smartwatches usually cost between $300 and $400

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some fitness watches can run for weeks on a single charge

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The Series 7 can go from zero to 80 percent power in just 45 minutes and a full charge in 75 minutes

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Many smartwatches include onboard GPS among their fitness features

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Health tracking on smartwatches has also seen progress over the years

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Both Apple and Fitbit devices estimate blood oxygen levels