Smoke Alarm BR 166. Photoelectric detector. tested in accordance with EN 14604. Optical function display. with test button for the functional check. Acoustic alarm (85 dB). Acoustic signal when the battery is low. 9 V battery included. Includes mounting materials. In colourful display-packaging. Height x Diameter 35 x 110 mm. Signal sound 85 dB. Battery type 1 x 9 V.