... it’s led bluetooth bracelet. 2. Sleep monitor, concerned with the with the quality of sleep. Bracelet know when you sleep ,and ... 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, Blue, Grey, Black, Pink, Purple ...