SpO2 Measuring  5ATM Waterproof  Heart Rate Zones Monitoring & Warning  1.1" JDI Full Reflection Screen  7 Sports Tracking, Swimming swolf Data  40 Days Standby Time  MCU: Nodic nRF52840 Sensor: Gyroscope, Accelerometer, PPG Heart Rate Display: 1.1 Inch JDI Screen, Full Touch, 218*218 Resolution  Working Time: 15 Days  Standby Time: 40 Days  Water Resistant: 5ATM  Bluetooth: BLE4.2, Support BLE5.0