RED indicator For setting up call and alarm systems. Monitoring a current loop for interruption or short circuit. With storage of the alarm status (can be switched off). With reset input. Permanent acoustic alarm. Typ. 70 dB at a distance of 1 m. Pulsating optical alarm. Maintenance-free thanks to the use of LEDs. An emergency power supply is required for installations in accordance with DIN VDE 0834. No spreader. Screw fastening via keyholes.