Any iPhone or iPad running iOS 4.2 or newer has AirPlay built in. Note that Roku and smart TVs require AirPlay 2 on your Apple devices, which is available with iOS 12.3 or later and MacOS Mojave 10.14 ...
Races are shown live on ESPN (USA), Sky Sports (UK), Kayo Sports (Australia) and F1 TV Pro (RoW), though lucky fans in some countries – such as Austria – can watch a free F1 live stream of every GP!