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The smartwatch market doesn't have many hybrids, which makes the Steel HR smartwatch a member of a rare breed. It's neither an Android Wear nor a Tizen device (it's obviously not a Watch OS wearable either) - it's half analog watch, half smartband. It has a physical watch face that doesn't change and a small screen. All of that makes for battery life measured in days, not hours, and a unique wearable, which we rather enjoy handling. You may or may not have heard of Withings - it was a company that made fitness devices, smart scales and connected watches. Nokia acquired Withings...
Source: https://www.gsmarena.com/nokia_steel_hr_handson-news-28538.php