Ios watch appliance type second screen compatible devices apple ipad apple ipod apple iphone 5 apple iphone 6 style modern housing material aluminium casing properties shockproof scratchproof housing colour silver housing design rectangular watch strap colours silver white armband features interchangeable bracelets operating system watchos 3 display type oled display size 15 inch display resolution 272 x 340 pixels touchscreen capacitive force tou