Base with analog siren and built-in loop powered flash. Designed, manufactured and certified according to EN54-3 standard. It has an acoustic output of 75 dB at 1 meter with a selection of up to 10 tones. Input for power option from external source. Acoustic monitoring system through internal microphone. Volume control on the siren itself. Up to 30 units powered from the analog loop itself. Consumption: 6 mA (alarm); 500 µA (rest). For indoor installations (degree of protection IP21). Operating temperature: -10 ° C to 70 ° C. Dimensions: Ø127 x 47 mm. Requires SPB-2W base for connection. Does not include sensor.