Simply but a much-needed upgrade for your GBA-SP.
Replace the proprietary charging port on the GBA-SP with a USB-C port that works for both charging (via USB-C to C or A to C cables) as well as supporting 3.5mm headphones (the only one in the world that does, until it gets cloned).
The kit comes with a 3.5mm to USB-C adapter, the USB-C port and a cover in both black and clear.
Fine soldering required.
Install guide here USB-C Charging (GBA SP) - RetroSix Wiki
