Samsung Galaxy Watch 4 44 mm SM-R870 Black

Everyday smartwatch for active users

The Samsung Galaxy Watch 4 44 mm SM-R870 Black is a new wearable designed for people who want health insights and phone connectivity on their wrist. It runs Wear OS and integrates Google apps so you can manage calls, texts and notifications without reaching for your phone. The black band and case give it a single look that works from the gym to the office.

Body composition and run coaching headroom

Automatic workout tracking covers common activities while advanced run coaching monitors heart and lung endurance through VO2 max estimates. Body composition analysis adds a snapshot of muscle, fat and water metrics. Continuous SpO2 tracking and advanced sleep scoring run overnight, but the sensors are not medical devices and cannot replace clinical diagnostics.

Wear OS platform limits

The watch relies on the Wear OS ecosystem for apps, payments and voice assistance, so functionality depends on the apps you install and the phone you pair it with. Group challenges need other Galaxy Watch users to be effective. Battery life varies with GPS, always-on display and sensor use, so heavy tracking days will require a recharge before the next morning.