- Internal modification control chip for Nintendo DS
- Add two functions to the X and Y buttons when playing GameBoy Advance games
- 3 modes: Turbo button mode, L/R mode, and OFF
- Turbo mode: X and Y function as turbo buttons for A and B
- L/R mode: X and Y function as R and L for GBA games
- Toggle modes by pressing Select + L
- LED indicator for chip functions
- Easy to install - 10 wires to solder
- Chip comes with stick-on insulation tape and pre-cut soldered wires
- Detailed instructions and full diagram available

留意这3段话就可以了,其余可以忽略.......

- Turbo mode: X and Y function as turbo buttons for A and B
- L/R mode: X and Y function as R and L for GBA games
- Toggle modes by pressing Select + L

感觉这3样东西都是多余的,NDS本身设计对玩GBA没什么阻碍,加上针对GBA的模式没什么意义...