Voltage supply is made by alarm installation (12V). High performance Piezo siren with 110dB-Schalldruck with approx. 400mA, red signal strobe light (1,5Hz, 2Ws). Housing before sabotage doubles protected: against opening with sabotage magnet contact and against Ausschäumen with perforated plate. Weatherproof execution from coated aluminum. BxHxT 18x23x12cm