SO4 The SO4 is a weatherproof motor driven siren designed for vertical mounting and designed for outdoor warning over small/medium areas. Manufactured from cast aluminium, it is rugged in construction, has a continuous rating and is built for a long life outdoors. Applications - Fire alarm; security alarm; general safety High sound output (up to 125dB) Powerful low frequency sound Weatherproof to IP55 Vertical siren for easy mounting Low voltage DC and high voltage AC variants warning; conveyors; process control alarm; vehicle alarm Audibility (tone) at 1m (typical) Current (tone dependent) IP Rating: IP55 Rating: Continuous Construction: Cast Aluminium Body Frequency: 900Hz Operating Temp: -30ºC to +45ºC Cable Entries: 1 Weight: 4.5kg Signalling Solutions