This circuit continually monitors the 230VAC mains voltage for a power failure. At that point the FK802 turns on a 6Volt filament lamp powered by 4 AA Alkaline cells. The circuit draws very little current.
Operation Voltage : 220VAC
PCB Dimensions : 1.60" x 1.19" x 0.8" (40.6mm x 30.22mm x 20mm)