Glow Stick

The Glow Stick is a novelty item consisting of a plastic tube containing two chemicals which combine when the tube is bent, so producing a luminescent glow.

Pre-Unlimited
This object can be used to illuminate dark levels. It's quite useful, since it can be equipped by the player and doesn't get short-circuited underwater.

Post-Unlimited
When you click on this object, an turn ON option will appear, selecting it makes the stick emit a green glow. However, once turned ON, you can't turn it OFF.