The Edwards 7641 and 7641R series dome stations are used to visually indicate the placement of calls from a connected pull station. Stations are available with 1, 2 or 4 lamps, the domes, available in white or red, are designed with barriers between the lamps to prevent visual interference of signals the 7641 and 7641R mount in a standard single or double gang box with a plaster cover and a minimum depth of 1-1/2 in (38mm). Boxes and plaster covers not supplied.