Base with analog siren fed by loop. Designed, manufactured and certified according to the EN54-3 standard. It has an acoustic output of 70 dB at 1 meter with a choice of 3 tones. Input for the external source power option. Acoustic monitoring system by internal microphone. Up to 60 units powered from the analog circuit itself. Consumption: 4.5 mA (alarm); 820 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 your connection. Does not include sensor.