The Bakeey P90 smart watch comes with a full touch screen, multiple colors, and not one, but two straps (metal and silicone) for very low $18.99. It has a regular rectangular shape and is available in three colors: black, pink, silver.
With a real operating system like Android or Wear OS, the firmware is responsible for its operation. It also comes with a mobile app for Android and iOS to make it more efficient. Some functions can be used without any extra equipment, such as pedometer, heart rate, blood pressure, blood oxygen measurement, stopwatch. The collected data can then later be synchronized with your mobile phone and tablet.
According to the manufacturer, you can use it for 7 days on a single charge, but it has a maximum of 15 days if you use it at a very minimal amount. The 180 mAh battery has approx. Recharges in 2.5 hours.