in first-person shooter (fps) games, the scroll wheel is usually set to change weapons. because of this some gaming mice, such as logitech g500, implement a locking feature that lets the mouse switch between scrolling in steps (needed for gaming) and continuous scrolling (good for web browsing). the scroll wheel is also sometimes used to control the zoom of scoped weapons and binoculars. fps games with an emphasis on realism may choose to use the wheel for changing between stances or adjusting the range settings on iron sights. since the introduction of tilting scroll-wheels, many fps games use the left-right motion of the scroll wheel to cause the player to lean left and right. a less common use is to use the mouse wheel to adjust the player's speed of movement.