The LS-201 call indicator is mounted on a double gang, stainless steel plate. The call indicator may be mounted in any position. The dome cover is illuminated by an incandescent lamp (can be configured in 1-3 lamps). The audible tone sounder is a piezoelectric type, black plastic. When an associated call station is activated, the LS-201 lights and will sound the piezoelectric tone device. Corridor lights can be made in 1-3 light configurations with white or red domes. Lights can be made red, blue, amber, yellow, or green with additional filters. Domes can also be silk-screened. Tone can be steady, intermittent, or chime.