| Network |
| Technology |
No cellular connectivity |
| 2G bands |
N/A |
| GPRS |
No |
| EDGE |
No |
| Launch |
| Announced |
2014, September |
| Status |
Available. Released 2015, May |
| Body |
| Dimensions |
38.6 x 33.3 x 10.5 mm (1.52 x 1.31 x 0.41 in) |
| Weight |
40 g body (2.72 oz) |
| Build |
Glass front (Sapphire crystal), ceramic/sapphire crystal back, stainless steel frame |
| SIM |
No |
|
IPX7 water resistant up to 1 meter and 30 minutes |
| Display |
| Type |
Retina OLED, 450 nits (peak) |
| Size |
1.5 inches, 7.1 cm2 (~55.1% screen-to-body ratio) |
| Resolution |
340 x 272 pixels (~290 ppi density) |
| Protection |
Sapphire crystal glass |
|
3D Touch display |
| Platform |
| OS |
watchOS 1.0, upgradable to 4.3.2 |
| Chipset |
Apple S1 (28 nm) |
| CPU |
520 MHz Cortex-A7 |
| GPU |
PowerVR SGX543 |
| Memory |
| Card slot |
No |
| Internal |
8GB 512MB RAM |
| Camera |
|
No |
| Sound |
| Loudspeaker |
Yes |
| 3.5mm jack |
No |
| Comms |
| WLAN |
Wi-Fi 802.11 b/g/n |
| Bluetooth |
4.0, LE |
| GPS |
No |
| NFC |
Yes |
| Radio |
No |
| USB |
No |
| Features |
| Sensors |
Accelerometer, gyro, heart rate |
|
Natural language commands and dictation |
| Battery |
| Type |
Li-Ion 205 mAh, non-removable (0.78 Wh) |
| Charging |
Wireless charging |
| Stand-by |
Up to 18 h (mixed usage) |
| Misc |
| Colors |
Stainless Steel/Red, White, Brown/Black/Blue/Red/Marigold/Jay Buckle, Blue/Stone Leather Loop, Silver/Space Black Milanese Loop, Link Bracelet, Space Black Stainless Steel/Black, Black Link Bracelet, Pearl Woven Nylon |
| Models |
A1553 |
