From KickStarter.
FitOn: World's 1st Blood Oxygen Saturation Smartwatch
FitOn is a comprehensive fitness tracker with SpO2 (blood oxygen saturation) + HRV (heart rate variability) + respiration measurement.
The point that is a world first is that it can measure blood oxygen saturation. There doesn't seem to be a smartwatch on the market that can do this. The water resistance is IP68, which is perfectly fine for applications like swimming in a pool or ocean. However, it says that it should not be used in environments with deep depth (severe water pressure). The data measured by FitOn can be saved and analyzed by connecting to the app on your smartphone via Bluetooth.
As for the price, 49$ is the lowest price at the moment. The market price is expected to be around 80$ and they want to sell it.
