Brand: Zeblaze Dimension : 45.7 mm X 45.7 mm X 12.7 mm Weight : 48.7 g (with wristband), 28 g (without wristband) Type : AMOLED Size : 1.43″ Ultra HD AMOLED Display Resolution : 466*466 pixels, 326 PPI Brightness : Up to 1000 nit Touch Screen : YES Case : Zinc Metal Bezel + Plastic Buttons : Stainless Steel Buckle : Stainless Steel Wristbands : Durable and comfortable fluoroelastomer strap (22 mm width, compatible with standard 22 mm quick-release bands) Wrist heart rate monitor Pulse oxygen blood oxygen saturation monitor Proximity sensor Accelerometer Bluetooth Version : BLE 5.2 Smartphone Compatibility : Android 5.0 or iOS 10.0 and above Operating Temperature : -20°C to 40°C Water Resistance : IP68 Capacity : 280 mAh Type : Li-Pol Typical Usage : Up to 18 days Heavy Usage : Up to 7 days Continuous Voice Calling : 365 minutes Charging Time : 1.5 Hours