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The optical heart sensor has been part of Apple Watch from the beginning, allowing you to quickly check your heart rate. Now it can also detect if your heart rate falls below a specified threshold for a period of 10 minutes when you appear to be inactive, triggering a low heart rate notification. This can be a sign of bradycardia, which can be serious if the heart is not pumping enough oxygen-rich blood around the body.
The Digital Crown was invented to provide an easy way to navigate on Apple Watch without obstructing the display. With Apple Watch Series 4, the mechanism has been totally re-engineered. Haptic feedback now delivers a precise, click-like feel as you scroll.
Bigger and even more powerful, the Apple Watch Series 4 speaker provides dramatically improved audio quality for Siri and Walkie-Talkie. In addition, the microphone has been relocated to the opposite side to reduce echo for clearer phone calls.
The S4 is more than just a processor. It’s a complete Silicon in Package (SiP), with the entire system fabricated onto a single component. This architecture allows Apple Watch to pack amazing capabilities into a tiny space. In fact, Apple Watch is the only product in the world that runs completely on a SiP.
-Improved accelerometer and gyroscope for fall detection
-Aluminium or stainless steel case
|Sensors||Altimeter, Ambient Light , Heart Rate Sensor|
|Operating System||WatchOS 5|
|Processor Type||Dual Core|
|Internal Music Storage||16GB|
|More||Improved gyroscope, Ion-X strengthened glass, Sapphire crystal and ceramic|
|Screen Resolution||324 x 394|
|Battery Life||18 hrs|