Apple Watch Series 12 46mm — Black Aluminum Case with Black Sport Band | MJEL4 | Apple S11 Chip | 4-Core Neural Engine | Always-On LTPO3 OLED | 416×496 / 326 PPI | Ceramic Shield 2 | 2000 Nits | ECG + Blood Oxygen + Temperature + Depth Gauge | Precision L1 GPS | Wi-Fi 4 + Bluetooth 5.3 + NFC + UWB | WR50m + IP6X | 24H Battery / 38H Low Power | 15 Min = 12H Use | watchOS | Apple Intelligence + Siri AI | Readiness + Vitals + Sleep Apnea | Crash Detection + Fall Detection | 46×40×9.7mm | 39.5g

Apple Watch Series 12 is the 2026 flagship of Apple’s standard Apple Watch line — introduced in September 2026 as the successor to Series 11 — and the first Apple Watch generation to integrate Apple Intelligence and Siri AI directly into the watch experience. The MJEL4 is the 46mm Black Aluminum GPS model with a Black Sport Band.

The Apple S11 chip (64-bit dual-core processor, 4-core Neural Engine, 64GB storage) is the new silicon at the heart of Series 12. Beyond raw compute performance — which handles the watch’s real-time health sensor processing, workout tracking algorithms and on-device machine learning simultaneously — the 4-core Neural Engine enables Audio Intelligence: a set of on-device AI audio features including Live Rewind (replay what was just said around you), Siri Recap (summaries of audio content), Sound Recognition (identifying sounds like smoke alarms, baby crying or doorbell while the watch is on your wrist), and faster on-watch Shazam. The Neural Engine also powers Apple Intelligence and Siri AI — a contextual, conversational version of Siri that understands personal context, takes actions across apps and responds naturally to complex requests from the wrist.

The Always-On LTPO3 OLED display runs at 416×496 pixels (326 PPI) across 1196 sq mm of display area, with a 1Hz minimum refresh rate for battery efficiency in the Always-On state and up to 2000 nits peak brightness — adequate for direct outdoor sunlight readability, which is the most demanding real-world display test for a device worn on the wrist. Ceramic Shield 2 (aluminum cases) is Apple’s proprietary front glass material co-developed with Corning — described as 60% tougher than the Ion-X glass used in Series 11, and tougher than any other smartwatch glass currently available. The 1 nit minimum brightness allows watch faces to remain visible at night without disturbing sleep.

Health sensing is the most comprehensive in the Series 12’s class. The second-generation electrical heart sensor produces an ECG (electrocardiogram) tracing via the ECG app — placing a finger on the Digital Crown while wearing the watch closes the electrical circuit for a single-lead ECG reading compatible with medical-grade analysis. The optical heart sensor monitors heart rate continuously and is now used for high-frequency background tracking every five seconds, enabling more granular heart rate data throughout the day. HRV (Heart Rate Variability) is now measured as often as every five minutes, providing continuous stress and recovery insight. Blood Oxygen (SpO₂) monitoring measures peripheral oxygen saturation. The temperature sensor tracks wrist skin temperature through the night for basal body temperature trends. Hypertension notifications are new to Series 12, alerting users to consistent elevated blood pressure patterns detected through the optical sensor. The Readiness app synthesises sleep, activity, heart rate and HRV data into a daily readiness score. The Vitals app tracks five overnight metrics (heart rate, respiratory rate, wrist temperature, sleep duration, HRV) and alerts when two or more are outside typical ranges simultaneously.

The depth gauge (accurate to 6 metres) combined with the water temperature sensor enables Oceanic+ and other underwater tracking apps, and confirms the 50-metre water resistance rating is not just a splash spec but designed for meaningful underwater use. WR50m under ISO 22810:2010 means pool and ocean swimming, snorkelling to 6m depth, and shallow water activities. IP6X dust resistance. New to Series 12: the depth gauge extends to 6 metres (up from the 6m depth on Ultra), making this the first standard Apple Watch with meaningful underwater capability beyond the wrist sensor.

The Readiness, Sleep apnea notifications, Irregular rhythm notifications, Crash Detection, Fall Detection, Emergency SOS and Check In safety features run continuously in the background. The Precision L1 GPS (GPS + GLONASS + Galileo + QZSS + BeiDou) provides phone-free route tracking for all outdoor workouts. Wi-Fi 4 (802.11n) supports both 2.4GHz and 5GHz. Bluetooth 5.3 for AirPods, accessories and phone connection. NFC for Apple Pay. Second-generation Ultra Wideband for precision spatial awareness with compatible iPhone and accessories.

Battery life: 24 hours normal use / 38 hours Low Power Mode. Fast charge: 15 minutes = up to 12 hours of normal use / 5 minutes = up to 10 hours of sleep tracking / 80% charge in approximately 30 minutes. Charger: Apple Watch Magnetic Fast Charger to USB-C Cable (1m) — included in box. Requires iPhone 11 or later with iOS 27 or later. 46×40×9.7mm. 39.5g (GPS). Black Aluminum case. Black Sport Band. 100% recycled aluminium case.