Switches for lighting may be in hand-held devices, moving vehicles and buildings. Residential and commercial buildings usually have wall-mounted light switches to control lighting within a room. Mounting height, visibility, and other design factors vary from country to country. Switches are often recessed within a finished wall. Surface mounting is also fairly common though is seen more in commercial industrial and outbuilding settings than in houses. Light switches boxes have plastic, ceramic or metal covers to prevent accidental contact with live terminals of the switch. Wall plates are available in different styles and colours to blend in with the style of a room.