[3] The S1P SiP shipped in the Apple Watch Series 1 is a stripped down version of the S2 that lacks the GPS functionality, it is otherwise identical.

[4] It uses a customized application processor that together with 512 MB memory,[1] 8 GB storage[1] and support processors for wireless connectivity, GPS, sensors and I/O constitute a complete computer in a single package.

This package is filled with resin for durability.

The device integrates discrete components like Wi-Fi, Bluetooth, GPS, NFC, touch controller, accelerometers, barometric sensor[5] and RAM.

In total, there are 42 individual silicon dies[6] integrated into the single S2 component.