"The three fire alarms with replaceable 9 V battery from Brennenstuhl in the colour white are impressive in all areas due to their quality and safety.
They also convince by the following features:Photoelectric detector, tested according to EN 14604Optical display of the function, with test button for functional testingPenetrating alarm signal 85 dBLow battery signal tonePenetrating alarm signal 85 dB9 V block battery included"