Four-wire design (two for power, two for alarm) Smart dual fixed/rate of rise heats work with photo chamber to catch fires faster Built-in drift compensation reduces false alarms Field replaceable optical chamber makes servicing a snap Small, low profile design blends in with any environment Compatible with most fire alarm and security panels 12-24VDC Essential Info A quality smoke detector with integrated fixed 135 F and rate-of-rise heat detector. Provides triple protection against fire. Must be wired into a security system that has power failure backup. This detector does not have internal battery backup or a built-in sounder. Manufacturer's part number ELE-541CXT. Manuals/Software 7497R Owner's Manual What's Included Hardwired Smoke & Heat Detector - ELE-541 CXT