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Apple Watch Series 1 Aluminium 38mm

Body
Build: Aluminium and composite back
Dimensions: 38.6mm x 33.3mm x 10.5mm
Weight: 25 g

Screen
Type: AMOLED capacitive touchscreen, 16M colors
Size: 1.5 inch
Resolution: 390 x 312 pixels
Protection: Ion-X strengthened glass with 3D Touch Display and 1000 nits

Memory
Card Slot: Not Available
Internal Storage: 8/16 GB
RAM: 768 MB

Software and Hardware
Software: watchOS 3.0, upgradable 4.3.2
Chipset: Apple S1P
CPU: Dual-core 780 MHz Cortex-A7
GPU: PowerVR G6200

Other Features
-IPX7 water resistant up to 1 meter and 30 mins
-Bluetooth 4.0
-Accelerometer
-Gyro