Apple Watch is unlike any device we've ever made. But we wanted interacting with it to be just as easy and intuitive as using your iPhone or working on a Mac. So we invented all-new ways to select, navigate, and input that are ideally suited to a smaller device worn on the wrist. The result is an experience that's both unique to Apple Watch and quintessentially Apple. --Apple Watch Sport featuresSilver or space gray anodized aluminum case.
 
Dimensions: Height: 38.6mm, Width: 33.3mm, Depth: 10.5mm, Case Weight: 25g (1.51 x 1.29 x 0.41 in inches, 0.88 oz)
Sport Band with stainless steel pin; Digital Crown
Gorgeous anodised aluminium case; Ion-X glass
Heart rate sensor, accelerometer and gyroscope; Ambient light sensor
Retina display with Force Touch; Composite back, Splash and Water resistant in rain, exercising, etc (but not to be submerged in water, as it's not waterproof!)