Edwards 52, 53 and 53D Series rotating beacons are visual signals suitable for use in indoor or outdoor applications to provide maximum brilliance and long-term durability with minimum maintenance. The polycarbonate dome allows for easy cleaning. The 52, 53 and 53D Series are ideal for use in high ambient noise applications, including security systems and factory/distribution facilities. The 53D Series is Diode Polarized for use in electrically supervised circuits.