Question GBA SP Ext.2 Accessories?

[Acronell]

While doing the planning for my SP project I'm trying to make sure I'm not locking out too much compatibility.

Looking to know if anyone has information on accessories that made use of the Ext.2 port of the SP, apart from the charger and audio out adapter.

Someone mentioned there were some FM Radio accessories that used it, but that doesn't concern me much.

 

[Aurelio]

While doing the planning for my SP project I'm trying to make sure I'm not locking out too much compatibility.

Looking to know if anyone has information on accessories that made use of the Ext.2 port of the SP, apart from the charger and audio out adapter.

Someone mentioned there were some FM Radio accessories that used it, but that doesn't concern me much.

EXT2 is only used for charging and headphones. I had an FM radio that was connected to EXT1, but it used it only to grab power from it.