The Amazfit T-Rex Pro has featured in an unboxing video that shows off all of the features of the upcoming military-grade smartwatch. The T-Rex Pro utilizes software based on real-time operating system (RTOS) and features a BioTracker 2 PPG optical sensor and SpO2 blood-oxygen level measurement all for €169.90 (US$203).
https://www.notebookcheck.net/Amazfit-T-Rex-Pro-stars-in-unboxing-video-Military-grade-smartwatch-with-SpO2-sensor-and-real-time-operating-system-for-EUR169-90-US-203.526417.0.html
What about track back feature? The stratos had this feature. # 1 reason to have Glonass gps if for hiking and being able to get back to staring point without ur phone. many will not buy with a track back option.