Charging Interface USB-C magnetic fast charging cable Body Dimension: Height: 49mm | Width: 44mm | Depth: 14.4mm | 61.3 g (45mm) | Loop Strap Design Brand Apple Model Watch Ultra Titanium Case (GPS Cellular) Calling Features Yes | Wi-Fi Calling | International Emergency Calling with Cellular Connection Battery capacity Built-in rechargeable lithium-ion battery | Apple Watch Magnetic Fast Charger to USB-C Cable (1m) Material Sapphire Crystal Front | Titanium frame Charging time 75 minutes Connectivity Wi-Fi 802.11b/g/n 2.4GHz and 5GHz | Bluetooth 5.3 | L1 and L5 GPS OS watchOS 9.0 Sweat & Water Resistance Water resistant 100 meters | Certified IP6X dust resistant Display 1.92-inch | 410 x 502 pixels resolution | Always-On Retina LTPO OLED display | Up to 2000 nits brightness | 49mm Case Diameter Chipset Apple S8 SiP with 64-bit dual-core processor | W3 (Apple wireless chip) | U1 chip (Ultra Wideband) Memory 32GB ROM Audio Dual speakers | Three-microphone array with beamforming and wind noise mitigation Sensors Blood oxygen sensor | Electrical heart sensor | Third-generation optical heart sensor | Ambient Light Sensors | Water Temperature Sensor Battery Life Up to 36 hours | Up to 18 hours (LTE) Other Features / Info Emergency SOS | International roaming | 100% recycled tungsten in the Taptic Engine | Always-on altimeter | Tested to MIL-STD 810H