Hispec ABMRFSMOKE/10 Mains Photoelectric Interconnectable Radio Frequency Smoke Alarm\n- 9V Battery (included) back-up, continuous to operate when mains power fails.- Test button for easily recommended monthly testing.- Easy to install with first fixed-base included.- Photoelectric Sensor for Slow Smoldering Fires.- It should be installed in every room and also use the bathroom and kitchen.\nThe Hispec ABMRFSMOKE/10 Mains Photoelectric Interconnectable Radio Frequency Smoke Alarm has 9V Battery (included) backup, continuous to operate when mains power fails. The radiofrequency alarms can be connected together with other smoke or heat alarms so that they all go off together if one alarm is triggered. Photoelectric alarms are designed to detect slow. smoldering fires which are most commonly caused by electrical fires or sofas. Ideal for living rooms, dining rooms, hallways, landing, and more.\nFeatures:\n- Low battery signal.- 85dB alarm signal.- Alarm source indicator.- Operating light.- Range over 80m in open areas.- Will not work without the battery installed.- BS EN14604:2005.- CE approved.- ROHS compliant.- Interconnectable with up to 20 other radio frequency units.- Test function and hush feature.- Body Material: Plastic.- Color: White.- Brand: HISPEC.