Model : Impulse Pro Model No. : PFB21 Bluetooth Version : 5.0 Standby Time : 15 Days & above OS Support : IOS 9.0 & Android 5 Strap Material : High Quality Silicon Features : Bluetooth Calling, Smart Calculator, Voice Assistant, Blood Oxygen Level, HR & BP Monitoring, Multiple Sports Modes, Multiple Watch Faces, Full Touch Control, Alarms & Notications, Calories Burn, Sleep Monitor