It wasn’t quite sneaking in the back door, but only the release of Apple’s first foldable smartphone stood between the introduction of the Apple Watch Ultra 4 and the headlines. The iPhone Duo will be getting its roses from reviewers and users for months to come, but the brand-new flagship of the Apple Watch family and all of its new features certainly won’t be ignored. You can have your own 49mm GPS + Cellular model waiting for you when it officially arrives this Friday, Sept. 18, by pre-ordering now at Amazon for $799.
Apple boosted the battery of the Ultra 4 so it runs up to 45 hours in Max Extended Workout mode, which covers a full ultramarathon with room to spare for the post-race debrief. Fast charging returns at 15 minutes for up to 18 hours of use, so a short charge window before a morning workout can salvage a day you forgot to top it off the night before. Heart rate sensing is rated as the most accurate in a wearable, and the Ultra 4 now takes HRV readings as often as every five minutes, which gives the readiness and recovery features more data points to work with between sessions. Background heart rate checks every five seconds are new, and they’re able to catch anomalies that would slip through a broader sampling window.
Fitness First
The fitness feature set covers the expected distances: dual-frequency GPS for precision in environments where single-frequency loses signal; Heart Rate Zones, Custom Workouts, and training load tracking across distance running, triathlons, mountain biking, and strength work. The Pacer feature rounds out the running tools. None of that is radically new territory for the Ultra line, but the Ultra 4 tightens the integration in ways that will read as refinements to anyone who found the previous models almost-but-not-quite complete.
Safety features like crash detection and hard fall detection carry over from the Ultra 3, but the Ultra 4 adds satellite communications for areas without cell service or Wi-Fi. That’s a specific need for hikers, backcountry runners, and open-water swimmers who spend time in genuinely remote terrain. The Ultra 4 handles depths to 100 meters and pairs a titanium case with a sapphire crystal display for rugged credentials that justify taking it somewhere you wouldn’t bring your daily driver.
A Friendlier Siri
Siri AI gets a conversational upgrade, with Apple promising natural back-and-forth interaction rather than discrete command-response exchanges. Audio Intelligence adds Live Rewind and Siri Recap for catching or summarizing conversations. Some of those features are rolling out in English first, with additional Audio Intelligence capabilities arriving in beta form later in 2026, so buyers who prioritize those tools should note the timeline. Cellular connectivity is built in, so calls, music streaming, and AirPods pairing all function without an iPhone nearby.
The Ultra 4 isn’t for the buyer who just wants a basic fitness tracker. It’s for the one who runs trails in places where getting hurt without a signal is a real scenario, or who finds their existing smart watch battery genuinely limiting for long training days. Pre-orders are open now at Amazon, with shipping expected when the watch officially launches on Sept. 18.
