Toggle On/Off: Press the Light button once for on and once for off. This works just like a GBA-SP without a Stealth Dimmer except that when the light turns on it remembers the last brightness set by the dimming controls.

Dimming: Hold down the Light button, then press A to make the frontlight brighter or B to make the frontlight darker. Release the buttons when desired brightness has been reached. This setpoint will be remembered when turning the light on and off with the Light button.

Instant On/Off: The brightness setpoint can be overridden by holding the A (full on) or B (full off) button when the GBA-SP is powered on.

Disable Auto Power-Save: Hold the Light button down for 5 seconds to prevent the dimmer from shutting off the frontlight after 5 minutes of inactivity. The light will blink once to let you know that power-save has been disabled. To re-enable it, hold the Light button for 5 seconds again. (the light will blink twice)