The macamdpgbk macbook airreg connectivity kit is an add on accessory bundle that extends the capability of your port limited macbook the kit contains 3 startechcom adapter products to connect your macbook air or similarly configured macbook proreg to an external hdmireg or vga display and a wired gigabit ethernet network as needed though extremely portable ultra thin laptops sometimes lack the necessary ports to connect to various displaysprojectors and wired networks when traveling