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Battery
Charging - Wireless
Type Li-Ion 570 mAh Li-Ion 250 mAh (0.94 Wh), non-removable
Body
Build Glass front, stainless steel frame Glass front, composite plastic back, aluminum frame
Dimensions 50.1 x 38.3 x 12.9 mm (1.97 x 1.51 x 0.51 in) 42 x 35.9 x 10.5 mm (1.65 x 1.41 x 0.41 in)
SIM eSIM (market/region dependent) No
Weight 52.3 g (1.83 oz) 30 g body (2.47 oz)
  5ATM water resistant ECG certified IPX7 water resistant up to 1 meter and 30 minutes
Camera
  No No
Comms
Bluetooth 5.0, A2DP, LE 4.0, LE
NFC Yes Yes
Positioning GPS, GLONASS, BDS, GALILEO, QZSS No
Radio No No
USB No No
WLAN Wi-Fi 802.11 a/b/g/n Wi-Fi 802.11 b/g/n
Display
Protection - Ion-X strengthened glass
Resolution 378 x 496 pixels (~327 ppi density) 390 x 312 pixels (~302 ppi density)
Size 1.91 inches 1.65 inches
Type LTPO AMOLED Retina OLED, 450 nits (peak)
  - 3D Touch display
Features
Sensors Accelerometer, gyro, heart rate, compass, barometer, SpO2, thermometer (skin temperature) Accelerometer, gyro, heart rate
  Temperature sensing (0.1˚ accuracy) Natural language commands and dictation
Launch
Announced 2023, August 29 2014, September. Released 2015, April
Status Available. Released 2023, September 08 Discontinued
Memory
Card slot No No
Internal 32GB 2GB RAM 8GB 512MB RAM
Misc
Colors Black, Silver 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 - A1554
Network
2G bands N/A N/A
3G bands HSDPA 850 / 900 / 2100 -
4G bands LTE -
EDGE - No
GPRS - No
Speed HSPA, LTE -
Technology HSPA / LTE No cellular connectivity
Platform
Chipset Qualcomm Snapdragon W5+ Gen 1 (4 nm) Apple S1 (28 nm)
CPU Quad-core 1.7 GHz Cortex-A53 520 MHz Cortex-A7
GPU Adreno A702 PowerVR SGX543
OS ColorOS Watch 3.0 - China watchOS 1.0, upgradable to watchOS 4.3.2
Sound
3.5mm jack No No
Loudspeaker Yes Yes
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