Professional swimming SWOLF, based on HRV health function, Afib, blood oxygen (optional)
Clock, date display
Data storage/OTA upgrade/Breath training
Heart rate monitoring/Sleep monitoring/Step monitoring
Colorie  monitoring/Standing monitoring/Distance monitoring
Arrhythmia monitoring/Blood oxygen function/Pressure value function

Material: Zinc + Silicone
Screen size: 1.3 inches
Battery: 220mAh
Chip: NRF52840
Resolution: 240x240
Waterproof: 5atm