Fitness tracking company Polar has launched the Loop , a $200 screenless wearable that it says will have no subscription fees. Preorders opened on Wednesday, and the Polar Loop will start shipping on Sept. 10.

Like other fitness trackers, the Polar Loop will log steps, sleep patterns and daily activity patterns. But Polar is touting the lack of a screen as "unobtrusive" and "discreet."

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The Loop is a wearable wristband that has eight days of battery life with continuous use and stores four weeks' worth of data. It syncs with the Polar Flow app to view stats and analyze sleep and training data, among other information.

Because it has no buttons, activities can be started in the

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