Optical autonomous microdetector authorized for domestic use, of high quality and useful life of 10 years. Fed by means of battery of lithium of high quality of 3V, included. He has acoustic indicator of alarm of 85dB and visually, by means of red LED. Sonorous sign in case of breakdown. Push-button for test of functioning and silence. Easy to install. Screws of assembly incluída. Dimensions: Ø51 x 43 mm.