(Bloomberg/Samantha Murphy Kelly) — Garmin Ltd. on Wednesday launched an arm band for wear during sleep that can track vital health metrics, stepping up competition with companies like Whoop Inc. and other emerging players.

The company’s $170 Index Sleep Monitor — a first for the fitness devices maker — is worn on the upper arm like a blood-pressure cuff and tracks blood oxygen saturation, heart rate variability, respiration rates, breathing patterns and skin temperature. It also provides sleep metrics like hours slept and data on different stages of sleep.

The device is screen-free and promises seven nights worth of battery life on a single charge, according to the company. It also has features like menstrual cycle insights and a smart alarm clock that will wake up a user with specific vibration patterns based on how they are sleeping during a pre-selected window.

The launch comes as Whoop, Samsung Electronics Co. and Apple Inc. are either experimenting with new form factors like health-centric rings and earbuds or are adding new sleep and fitness tracking features. The expansion is notable for Garmin, which does sell scales and blood-pressure monitors but is mostly known for its fitness watches.

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In April, Garmin reported record first quarter revenue of $1.54 billion, surpassing Wall Street expectations. It has tried to excite investors with new offerings, including a subscription service to create more personalized insights.

Last week, Garmin announced the Venu X1 watch, which has a large screen to better compete with the Apple Watch Ultra. It also recently rolled out two more classic sports watches, including the Forerunner 570 and Forerunner 970.

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