"Optional extras" refers to additional things that you can choose to have or do in addition to the basic or necessary options. They are not essential or required, but are options available for you to choose if you want. Full definition
You can choose higher limits as well as optional extras such as collision coverage, personal injury protection and comprehensive coverage depending on your driving lifestyle and your needs. (carinsurancequote.net)
The list of optional extras includes such luxury features as the convenience key, four - zone automatic air conditioning, a dark glass panoramic roof and a cool box. (topspeed.com)
Additionally, ABS and passenger airbags are offered as optional extras on all variants. (cardekho.com)