Apple Watch Ultra 3 Rugged Titanium Build – Grade 5 titanium, sapphire crystal, MIL-STD-810H, IP6X, 100m water resistance, 40m dive-proof. Brilliant Display – 1.98″ Retina LTPO3 OLED, 3000 nits brightness, always-on, sapphire crystal protection. Advanced Sensors – ECG, SpO2, VO2max, heart rate, body temp, depth gauge, compass, barometer, altimeter (-500m to 9000m). Strong Connectivity – eSIM with 5G, Wi-Fi, Bluetooth 5.3, NFC, UWB Gen2, Emergency SOS & satellite. Battery & Charging – Wireless fast charging (0–80% in 45 min), long endurance for outdoor use.Audio – Dual 86-decibel loudspeakers.