The CM-AF550RF from Camden Door Controls is a double gang, mushroom push button, red, 'Push to Lock' with LED annunciator, 'Locked', French. Camden's CM-AF500 Series illuminated annunciators are designed to provide critical messages to building occupants. When not illuminated, the sign (text and/or graphics) is invisible. When illuminated, the text/graphics are highly visible - even in bright daylight. CM-AF500 series signs and push buttons are weatherproof and vandal resistant. Field selectable 12/30V AC/DC operation allows the sign to be used in a variety of low voltage applications, including automatic door, access control and other low voltage systems.