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 grey housing design rectangular watch strap colours black green armband features interchangeable bracelets operating system watchos 3 display type oled display size 165 inch display resolution 312 x 390 pixels touchscreen capacitive force touch