Base with analog siren and built-in flash powered from loop. Designed, manufactured and certified according to standard EN54-3. It has an acoustic output of 75 dB to 1 meter with selection of up to 10 tones. Input for power option from external source. Acoustic monitoring system by internal microphone. Volume control in 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 its connection. Does not include sensor.