| Network | |
|---|---|
| Technology | No cellular connectivity |
| 2G bands | N/A |
| GPRS | No |
| EDGE | No |
| Launch | |
| Announced | 2014, September |
| Status | Available. Released 2015, April |
| Body | |
| Dimensions | 38.6 x 33.3 x 10.5 mm (1.52 x 1.31 x 0.41 in) |
| Weight | 25 g body (2.19 oz) |
| Build | Glass front, composite plastic back, aluminum frame |
| SIM | No |
| IPX7 water resistant up to 1 meter and 30 minutes | |
| Display | |
| Type | OLED capacitive touchscreen, 16M colors |
| Size | 1.5 inches, 7.1 cm2 (~55.1% screen-to-body ratio) |
| Resolution | 340 x 272 pixels (~290 ppi density) |
| Protection | Ion-X strengthened glass |
| 3D Touch display 450 nits max brightness (advertised) |
|
| 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 | |
| Non-removable Li-Ion 205 mAh battery (0.78 Wh) | |
| Charging | Wireless charging |
| Stand-by | Up to 18 h (mixed usage) |
| Misc | |
| Colors | Silver/White, Orange, Blue; Gray/Black; Rose Gold/Lavender, Stone; Gold/White, Blue, Yellow, Apricot, Royal Blue, Pink/Royal Blue/Gold&Red/Black Woven Nylon |
| Models | A1553 |