[Grim_]

The radius is how far away the player can be for the function to be called.
For example, if you set the radius is 3, then the player must be within 3 (meters?) of the x, y, and z coordinates.
Though, you can set it to whatever you like, depending how close or far away you wish the player to be.

@Abernethy: No, he put it at the end of the function, so I stated it needed to go at the front.