The Apple Watch comes with an AMOLED Retina display, and is offered in two sizes: the 38mm model, which has a resolution of 272 x 340 pixels (290 ppi), and a 42mm model that features a resolution of 312 x 390 pixels (302 ppi). The Watch is powered by Apple's custom-designed S1 CPU, and comes with 8GB on-board storage. In terms of sensors, there's an accelerometer, gyroscope, heart rate monitor, microphone and a speaker. The heart rate sensor uses a combination of infrared and visible-light sensors to determine your heart rate. Connectivity options on the Watch are in the form of NFC, Wi-Fi 802.11b/g/n and Bluetooth 4.0.

iFixit notes that the display panel was hard to remove as the "display cables are trapped under a springy bracket." Once the display is removed, we get a look at the Taptic Engine and Digital Crown, as well as the 3.8 V, 0.78 Wh 205mAh battery (secured by light adhesive) that is powering the Watch:

There are two model numbers that distinguish the 38mm Watch from the 42mm offering, with the former dubbed A1553 and the latter A1554. The first batch of units are now being delivered to customers in Australia, with several interested buyers lining up outside high-end boutiques that will stock the Apple Watch in limited quantities from later today. Head to the source link for more high-res images of the teardown.

Source: iFixit