Sleep monitor, concerned with the with the quality of sleep. Bracelet know when you sleep ,and also know if you sleep well through the monitoring date. 3. APP Open dynamic blood oxygen heart rate , test dynamic blood oxygen heart rate per second,like fitness wristbands. 4. Real time synchronization and medical oxygen clamp test. precision can reach the medical level. 5. Silicone watchband, perfect movement.Technical Datas:Bluetooth versionBluetooth 4.0, connect with Android or IOSColoursRed, Bl