Samsung Galaxy Watch4 - Preowned

Features:

It runs on Wear OS Powered by Samsung and offers features like fitness tracking (body composition, blood oxygen, sleep tracking), blood pressure and ECG monitoring (after initial calibration), and seamless access to Google apps like Google Assistant, Google Maps, and Google Play. 

Models:

It comes in two models, the Galaxy Watch4 and the Galaxy Watch4 Classic, both with circular AMOLED displays and available in 40mm and 44mm sizes. 

Connectivity:

The Bluetooth model allows connection to smartphones for notifications, music control, and app access.