When you first power on your Game Boy, it will be running at normal speed. At any time during gameplay you may change the clock speed by simultaneously pressing L, R and Select (or whichever combination of 3 buttons you connected the GBAccelerator to). The power LED will indicate which speed is currently selected. The following table shows the available speeds and their corresponding LED codes:

Mode	Speed	LED
Normal	1x	Solid
Fast	1.5x	1 Blink
Ultra	1.75x	2 Blinks
Slow-Motion	0.85x	Fade