Brand: Zeblaze Model: ZEBLAZE GTR 3 PRO Smartwatch Processor: Realtek 8763EW Charging: Magnetic Charging Base Calling Features: Yes, Smart Voice Calling Battery Capacity: 260 mAh Material: Hand-polished 316L stainless steel frame (Bezel) Drilling carbon coating (Case) Stainless steel (Button & Buckle) Charging Time: Approx. 1.5 hours SIM: No Display Resolution: 466 x 466 pixels Operating System Compatibility: Android 5.0+ and iOS 10.0+ Display: 1.43″ Ultra HD AMOLED Display Sweat & Water Resistance: IP68 water resistance 3-Axis accelerometer 3-Axis gyroscope sensor Wrist heart rate monitor Pulse Ox blood oxygen saturation monitor Up to 14 days (Typical usage) Up to 5 days (Heavy usage) Up to 365 minutes (Continuous voice calling) FitCloudPro App support BLE 5.2 Bluetooth connectivity Corning Gorilla Glass protection