"It's a functional, $19 Bluetooth remote for your phone that happens to be shaped like a watch."
The '1.85-inch HD Display with Bluetooth Calling' means you get a basic, low-resolution LCD screen and a simple speaker/mic that lets you answer calls from your wrist, as long as your phone is within Bluetooth range.
This is a justifiable purchase for someone who wants wrist-based notifications and call answering for the lowest possible price. It serves as a low-risk entry point for those curious about smartwatches but unwilling to spend more.
Anyone requiring reliable fitness tracking, a polished app experience, or a durable piece of hardware should look elsewhere. The sensor data is untrustworthy for training, and the build quality is commensurate with the disposable price.