Stand Alone Photoelectric Smoke Detector, Alarm dimensions: 5.5" dia., 1.6" height,Operating voltage: DC 9V,Audio alarm: 85dB Features: 10xLEDs, Ni-Cad battery, Bulb Type: 10xLED lights-green color(Bulb lifetime: over 20000hours)Battery Type: 3.6V 500MAh Ni-Cad batteries includedMaterial: Aluminum case and Acrylic panelMode of Operation: MaintainedRated supply voltage: 110V~240V/50~60HZOperation ...