Apple Watch Series 1 Sport 42mm Space Gray Aluminum Case with Black Sport Band 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