The Bakeey RC02 is an Amazfit GTR style smart watch, but there are differences and more color choices. It has an extra touch screen and has a low price, which is currently $27.49. It is available in black, gray / silver and gold watch cases, textured silicone and more demanding leather straps (interchangeable). It weighs 60g.
The touch screen has a pleasantly large 1.3 inch screen with 240 x 240 pixels resolution and variable brightness. A round display, so not just a rectangular display is placed inside the round watch face. The clock face can be changed.
If you do not have a genuine operating system (such as Android Wear), the firmware is responsible for its operation. It also comes with a mobile app (Android, iOS) to help you set up and use it more efficiently. Some functions can be used without any extra equipment, such as pedometer or heart rate measurement, sport modes. The collected data can then later be synchronized with your mobile phone and tablet.