| Network | |
|---|---|
| Technology | No cellular connectivity |
| 2G bands | N/A |
| GPRS | No |
| EDGE | No |
| Launch | |
| Announced | 2014, September |
| Status | Available. Released 2015, April |
| Body | |
| Dimensions | 42 x 35.9 x 10.5 mm (1.65 x 1.41 x 0.41 in) |
| Weight | 50 g body (2.82 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 | OLED capacitive touchscreen, 16M colors |
| Size | 1.65 inches, 8.6 cm2 (~56.8% screen-to-body ratio) |
| Resolution | 390 x 312 pixels (~303 ppi density) |
| Protection | Sapphire crystal 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 250 mAh battery (0.94 Wh) | |
| Charging | Wireless charging |
| Stand-by | Up to 18 h (mixed usage) |
| Misc | |
| Colors | Stainless Steel/Red, White, Brown/Black/Blue/Marine Blue Buckle, Blue/Stone/White/Storm Gray Leather Loop, Silver/Space Black Milanese Loop, Link Bracelet, Space Black Stainless Steel/Black, Black Link Bracelet, Pearl Woven Nylon |
| Models | A1554 |