a timer controlled fire and burglar alarm system using an economical circuit design and battery for prolonged and effective functioning and includes a thermo - electric infrared sensor , a filter and an amplifier to detect signal , a plurality of time priority circuits , a time - delay circuit , a timer controlled alarm setting circuit and timers with time display for setting and disarming of an alert condition and / or driving peripheral devices so as to function as a fire alarm , a burglar alarm and a visitor detection system .