Yale Smoke Detector E-Sd2

SEALED Photoelectric sensing technology Battery operated (1 x 9V included) Low battery indicator Stand alone unit Clip off bracket for easy installation and battery change 85dB Siren Dector coverage: 5m radius (75metre square) Non-radioactive photoelectric sensor, designed to alert you and your family to the presence of smoke. Low power consumption. Operated by a 9v battery for more than 1year. Easy installation. No external use of supply and no wiring is required. External test button on the cover for easy testing. No interference between smoke detectors if more than one device is installed. Unlimited number of devices can be installed in one dwelling.