Dimensions: height: 42.0mm, width: 35.9mm, depth: 10.5mm, case weight: 25g (1.65 x 1.41 x 0.41 in inches, 1.05 oz)
gorgeous anodised aluminium case; ion-x glass
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!)
sport band with stainless steel pin; digital crown
heart rate sensor, accelerometer and gyroscope; ambient light sensor