The GBA DIMMER II Mod Chip has a built in the 5 class amplifier circuit, giving you 8 levels of brightness you can adjust.

Total 7 wires, very easy to install it, so you don't need to drill your GBA for install the extra booster to adjust the GBA Afterburner brightness. To use, simply push the "SELECT" and push the "A" together - become brighter , push the "SELECT" and push the "B" together - become darker.

Left GBA is use the normal dimmer chip 1,the right GBA is use the DIMMER2,all are adjust to top level brightness.