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Choose whichever hues and additional changes you desire! Read more about mods below: In the absence of a battery mod, AA batteries are needed for the Gameboy. (not contained). THE FOLLOWING MODZ CAN BE ADDED ON Brightness Control - Toggling with L and R while holding Select controls multi-level brightness. Audio Amp and Speaker Upgrade - Increases audio volume by 4x for truly immersive sound! (Please take note that some games' programming may make this patch generate a buzz at lower volumes. Although it may not completely quiet the sound, the headphone jack still works. Jayboymodz simultaneously pressing L, R, and Start, Jayboymodz you can activate the GBA Accelerator OverClocking, which can speed up or slow down game play. Fantastic for sluggish RPG grinding! 1. 5x, 1. 75x, and. 85x are the speeds.