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Apple Watch Series 12 (Negro, Aluminium, 42 Mm, Correa Deportiva Negro M/L) Mjec4zr/A

Apple Watch Series 12 (Negro, Aluminium, 42 Mm, Correa Deportiva Negro M/L) Mjec4zr/A

Best price now

$389.99at AmazonChecked Nov 13

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Price facts

  • Last seen at $389.99 at Amazon on Nov 13.

Our take on the Apple Watch Series 12 (Negro, Aluminium, 42 Mm, Correa Deportiva Negro M/L) Mjec4zr/A

The Apple Watch Series 12 is Apple's flagship smartwatch, built around health tracking. It pairs a 42 mm OLED touchscreen (374 x 446 pixels) with Wi-Fi and GPS, and adds heart-rate sensing that Apple calls the most accurate on a wearable, plus HRV readings every five minutes for stress and recovery. New this generation is a daily Readiness score that weighs recent activity, overnight vitals and sleep quality. It suits iPhone owners who want serious health and training data on the wrist; Android users cannot pair it. Against rivals like the Samsung Galaxy Watch and Garmin watches, it leans on tight iPhone integration and app depth rather than multi-day battery life.

Best foriPhone owners who want detailed heart and sleep dataRunners and gym users tracking training loadPeople who want stress and recovery insights
Pros
  • Accurate heart-rate tracking with background readings every five seconds
  • HRV sampled every five minutes for stress and recovery
  • Readiness score combines activity, overnight vitals and sleep
  • Advanced workout metrics: Target Pace and Heart Rate Zones
  • Bright, sharp OLED touchscreen
  • GPS built in for outdoor runs and rides
Cons
  • Requires an iPhone; no Android support
  • Battery life is short next to Garmin and other rivals
  • Health insights are only as good as the data you feed it
  • Sport band in size M/L only fits a limited wrist range

Apple Watch Series 12 (Negro, Aluminium, 42 Mm, Correa Deportiva Negro M/L) Mjec4zr/A prices at every store

  • AmazonNew

    Availability unknown

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    $389.99Free shippingChecked Nov 13
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Apple Watch Series 12 (Negro, Aluminium, 42 Mm, Correa Deportiva Negro M/L) Mjec4zr/A price history

Lowest price we've seen: $389.99 on Nov 13 at Amazon. Tracked across 1 store since Nov 13.

About the Apple Watch Series 12 (Negro, Aluminium, 42 Mm, Correa Deportiva Negro M/L) Mjec4zr/A

The Apple Watch Series 12 is a smartwatch for tracking health and activity. It has an aluminum case with Ceramic Shield 2 and a 42 mm size. It comes with a black Sport Band in size M/L. The OLED touchscreen measures 374 x 446 pixels.

The S11 chip and improved optical and electrical sensors record heart rate at shorter intervals. The watch checks heart rate variability (HRV) every five minutes and logs heart rate in the background every five seconds. The Vitals app shows overnight health data, and the watch can measure blood oxygen saturation. A Readiness score is calculated each morning from recent activity, vital signs and sleep, then adjusts through the day.

For workouts, it offers advanced metrics, Pace Target, Heart Rate Zones and Workout Buddy, which uses Apple Intelligence on your iPhone. Apps such as Cycle Tracking and ECG add further health information. Fall detection and crash detection can call emergency services, share your location and alert your chosen contacts. The GPS model works with your iPhone or a Wi-Fi network for messages, calls, music, Siri and notifications.

Model
MJEC4ZR/A
Case
Aluminum, 42 mm, with Ceramic Shield 2
Color
Black
Band
Black Sport Band, M/L
Display
OLED touchscreen, 374 x 446 pixels
Chip
S11
Connectivity
Wi-Fi, GPS (satellite)
Battery
Up to 24 hours of normal use; 15 minutes of fast charging gives up to 12 hours
Heart tracking
HRV every five minutes; background heart rate every five seconds; ECG app
Health features
Blood oxygen, Vitals app, Cycle Tracking, Readiness score, sleep quality
Fitness features
Pace Target, Heart Rate Zones, Workout Buddy, advanced workout metrics, pedometer
Safety
Fall detection, crash detection, Emergency SOS
Smart features
Messages, calls, music streaming, Siri, notifications

Questions and answers

What is new in the Series 12 compared with earlier Apple Watches?
The headline addition is the Readiness score, which combines recent activity, overnight vitals and sleep quality into one daily signal. Apple also claims the most accurate heart-rate measurement on a wearable and samples HRV every five minutes.
Does it work with Android phones?
No. The Apple Watch Series 12 pairs with an iPhone only, so Android users should look at Wear OS or Garmin watches instead.
What is included in the box?
The watch with its Sport Band in size M/L, plus a charging cable. A power adapter is not included.
Can it track sleep and blood oxygen?
Yes. It logs overnight health data through the Vitals app and measures blood oxygen saturation, alongside sleep quality tracking.
Is the 42 mm size right for me?
The 42 mm case suits most wrists, and the included M/L Sport Band fits medium to large wrists. If you are near the edge of that range, check the band sizing before you buy.
Where is the Apple Watch Series 12 (Negro, Aluminium, 42 Mm, Correa Deportiva Negro M/L) Mjec4zr/A cheapest?
At Amazon, for $389.99, as of our latest check.

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