Задайте специальный вопрос к слову headphones и ответьте на него We have hot headphones for the whole group

What kind of headphones have we got for the whole group? Or: What kind of headphones do we have for the whole group? - We have hot headphones for the whole group.

Note the difference in the usage of 'have' and 'have got' While there is absolutely no difference in meaning, the latter expression is more frequent in British English.