* Space gray aluminum case
* ion-x glass
* retina display with force touch
* composite back
* digital crown
* heart rate sensor, accelerometer, and gyroscope
* ambient light sensor
* speaker and microphone
* wi-fi (802.11b/g/n 2.4ghz)
* bluetooth 4.0
* up to 18 hours of battery life1
* water resistant2
* watchos 2