Battery operated (9v battery included) Photoelectric sensor û advanced photoelectric sensor is Especially effective in detecting smoldering fires. Test button û tests unitÆs electronic circuitry, horn and battery Function. Red led û indicates that the smoke alarm is operating Properly and alarm condition. Low battery indicator û smoke alarm will chirp in the event of A low battery. Up to 85db sound level òsize: diameter 105mm in diameter x59mm depth
