The Game Boy Advance SP removed the traditional TRS headphone jack and replaced it with a custom connector (which was later re-used for the DS's power port). A

The Game Boy Advance SP removed the traditional TRS headphone jack and replaced it with a custom connector (which was later re-used for the DS's power port). An adapter to allow the use of standard TRS headphones was an optional extra purchase. https://en.wikipedia.org/wiki/Game_Boy_Advance_SP#Headphone_jack https://en.wikipedia.org/wiki/Game_Boy_Advance_SP#Headphone_...