Amazfit GTS 4 Mini Smart Watch for Women Men, Alexa Built-in, GPS, 120+ Sport Modes, 15-Day Battery Life, Heart Rate Blood Oxygen Monitor, Android iPhone Compatible-Pink (Renewed)

"Easily test your heart rate, blood oxygen saturation (SpO₂), and stress level simultaneously, with a single tap of the watch, for a result in as quick as 45 seconds.

And to keep you on top of your game, the watch will send helpful health reminders for: Abnormally High or Low Heart RatesAbnormally Low SpO₂ LevelsAbnormally High-Stress LevelsStress-reducing Breathing Exercise Dare to Dream Track your sleep quality through the light and deep sleep stages, and even the REM stage - where dreaming is said to occur, as well as monitor sleep breathing quality at night.

PeakBeats Workout Status Algorithm The watch is equipped with a self-developed motion algorithm, which assesses specialized data such as maximum oxygen uptake (VO2 Max), full recovery time, training load and training effect."