It’s been nearly two years since Polar entered the activity tracker market. Since the release of the Polar Loop in 2013, the wearable market has shifted towards devices that offer more than just basic activity tracking. We are now seeing trackers that can display smartphone notifications or included advanced features such as optical heart-rate sensors.

The Polar Loop 2 picks up where the original model left off, but is now tailored to the 2015 market. In addition to being able to track the steps you take, distance traveled, calories burned and your sleep at night, the Loop 2 is capable of displaying information on incoming calls, text messages and calendar alerts from your iPhone or Android device.
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https://www.cnet.com/reviews/polar-loop-2-preview/