watchOS 1.0, upgradable to v2.2, planned upgrade to v3.0
Chipset
Apple S1
CPU
520 MHz
GPU
PowerVR SGX543
Memory
Card Slot
No
Internal
8 GB, 512 MB RAM
Sound
Alert types
Vibration; Ringtones
Loudspeaker
Yes
3.5mm Jack
No
Comms
WLAN
Wi-Fi 802.11 b/g/n
Bluetooth
v4.0, LE
GPS
No
NFC
Yes
Radio
No
USB
No
Features
Sensors
Accelerometer, gyro, heart rate
Messaging
SMS(threaded view), Email, Push Mail, IM
Browser
No
Java
No
Battery
Battery
Non-removable Li-Ion 250 mAh battery (0.94 Wh)
Stand-by
Up to 22 h (mixed usage)
Talk time
Up to 3 h 40 min
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