Apple Watch Ultra 4 GPS 49mm Smartwatch Burgundy Trail Loop

Aerospace-Grade Titanium Case & Brightest Retina Display

Encased in a lightweight, corrosion-resistant titanium housing with raised edges to shield the flat sapphire front crystal, the Ultra 4 is built to withstand extreme shock and temperature variations. Its expansive Always-On Retina display reaches up to 3,000 nits peak brightness, ensuring effortless legibility in blazing direct sunlight or complete darkness.

High-Precision Dual-Frequency GPS & Offline Topo Maps

Featuring precision dual-frequency (L1 and L5) GNSS architecture, the watch delivers route mapping and distance accuracy in dense urban jungles or remote mountain wilderness. Download full-color offline topographic maps directly to the watch, complete with trail head details, elevation contours, and turn-by-turn navigation without requiring a connected iPhone.

Advanced Biometric Sensors & Apple Intelligence Analytics

Powered by an upgraded multi-channel optical sensor array and the S10 SiP processor, the Ultra 4 provides continuous 24/7 health tracking. Monitor real-time heart rate, arterial health, blood oxygen ($\text{SpO}_2$), ECG readings, and body temperature shifts. Integrated Apple Intelligence delivers personalized training load trends, sleep apnea detection, and automated recovery suggestions.

Certified 100m Water Resistance & Oceanic+ Dive Computer

Engineered for marine sports, the watch is EN13319 certified for recreational scuba diving and free-diving down to 40 meters. The built-in Depth Gauge and Water Temperature sensors launch automatically upon submersion, pairing seamlessly with the Oceanic+ app to function as a full-featured dive computer on your wrist.

Up to 72-Hour Battery Endurance in Low Power Mode

Designed to last through multi-stage marathons, weekend wilderness treks, and extended dive trips, the watch provides up to 36 hours of normal usage or up to 72 hours in Low Power Mode on a single charge. Fast-charging capability brings the high-capacity battery up to an 80% charge in under an hour.

Customizable Action Button & Emergency Safety Suite

The bright orange physical Action Button gives you instant hands-on control to mark GPS Waypoints, start a Backtrack route, or transition workout segments with a single press. For emergencies, the watch includes Crash Detection, Fall Detection, a high-decibel 86dB Emergency Siren audible up to 600 feet away, and satellite-based Emergency SOS connectivity.