The 442 audio/visual alarm devices are suitable for connection to 2-wire and 4-wire fire detection and alarm Systems. 441 will operate with both addressable and non-addressable fire detection control and indicating equipment. Activation is initiated upon connection of the operating voltage, allowing connection to either a switched supply or Via an addressable module. Visual, audible and audio/visual models available Red or white body available for audible alarm device Operates when the supply voltage is connected to the device Compatible with relay outputs from control and indicating equipment, or from an output module connected to addressable alarm circuit wiring Dc 24 v operation Loud sounder output of 85 db at 1 m Long-life leds Zero current load in quiescent condition