YK03 smartwatch Bluetooth call flashlight sports waterproof heart rate blood oxygen health monitoring

System requirements: Android 6.0 and above, iOS 10.0 and above, support Bluetooth 5.3Bluetooth version: BLE 5.3 (low power consumption)Bracelet memory: RAM_578KB+ROM_64MbBattery capacity: 300mAh_Standby time: about 35 days