The PSA Lifesaver 6000 model is a mains powered, 9V battery backed smoke alarm. The alarm uses photoelectric technology and is designed to be surface mounted on the ceiling or wall. It can be used as a single stand alone unit, or can be interconnected with up to 24 units.
When used with the LIF6000WB (wireless RF interlink baseplate), the alarm offers wireless interlinking capabilities as well as remote test/hush functionality with LIF6000THL (wireless smoke alarm controller)