Apple Watch Series 1 GPS

Apple Watch connects to your iPhone via Bluetooth 4.0 and displays notifications, apps, and more on its display. It can also connect directly to the Internet thanks to 802.11b/g/n Wi-Fi. The internal battery lasts for up to 18 hours of normal use and is recharged with an included inductive magnetic charger.

Features:
Apple Watch Dual-Core
WatchOS 3
Splash resistant
Heart rate sensor
Accelerometer
Gyroscope
Ambient light sensor
Composite back
Activity and Heart Rate Monitoring
OLED Retina display with Force Touch (450 nits)
Ion-X glass (strengthened glass)
272 by 340 pixels (38mm)
312 by 390 pixels (42mm)
Dimensions:

38mm

Height: 38.6mm
Width: 33.3mm
Depth: 10.5mm
Case Weight: 25g
42mm

Height: 42.5mm
Width: 36.4mm
Depth: 10.5mm
Case Weight: 30g