Modern Game Boy Advance mods, such as the IPS LCD or rechargeable battery pack, have a tendency to increase the hardware noise of the console, and cause an audible hiss. This flex PCB design by Helder's Game Tech is meant to be an easy-to-install solution, to help reduce the noise on modded consoles.
If you have an IPS modded GBA and notice noisy audio from the headphone jack, get this. If you are comfortable opening a GBA the soldering is pretty beginner friendly.
Helders the champ
Very easy to apply to gba, and helped reduce humming that might happen when adding the ips screen.
Helder's Game Tech GBA Power Cleaner