Battery powered back up siren as additional siren. It can be operated at the siren output of the G.A.S.-pro or WiPro. Due to the permanently charged battery, it alarms for up to 30 minutes even if the power supply is interrupted (e.g. if the battery is disconnected or the power supply is sabotaged). Power supply: 12VDC Sound pressure: approx. 105dB
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