Key specifications/special features Power source: 9 v battery (included). Audio alarm: & g e; 85 db /3 m Temperature range: 0 to 40 degree Humidity range: 5%-95% relative humidity(rh) Sensor: photoelectric Size: diameter 105 mm in diameter x59 mm depth Interconnects: no Easy to install with mounting base included Suitable for any room Low battery signal Test button for simple testing 100pcs in a carton
