"A $36 notification screen for your wrist with purely aspirational health tracking."
Bluetooth calling means the watch has a tiny speaker and microphone, allowing you to take calls from the wrist as long as your phone is within Bluetooth range and ambient noise is low.
This is for someone who wants the look of a smartwatch and basic notifications for a minimal price. It's a low-risk entry point to see if the form factor works for you, or for a user who primarily wants a large, customizable watch face.
Anyone serious about fitness tracking, sleep analysis, or health monitoring should save for a device from a brand with validated sensors. Users who expect high-quality call audio or integration with major fitness platforms will be disappointed.