In years when a free accessory item is offered, customers generally have the option to upgrade to a higher-tier model for a discounted price, such as opting for AirPods Pro instead of free AirPods and only paying the difference in price.
The promotion launches in different countries at different times of the year depending on school calendars, with those in North America and Europe typically launching in the June–July timeframe and those in the Asia–Pacific region launching in the January–February timeframe. Each promotion usually lasts about two months.