System Sensor SPRK S/F 26/02 They are also backwards compatible

They are also backwards compatible with legacy strobes

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The D285DH duct detector head is suitable for two-wire or four-wire application

Displays complete system point status information and includes control switches for remote control of critical system functions

System Sensor SPRK S/F 26/02 They are also backwards compatibleSpectrAlert Advance offers the broadest line of outdoor speakers and speaker strobes in the industry. From metal and plastic outdoor back boxes, to white and red plastic housings, to wall and ceiling mounting options, SpectrAlert Advance can meet virtu ally any application requirement. Wall mount outdoor speakers and speaker strobes can be used indoors or outdoors in wet or dry applications, and can provide reliable operation from 40F to 151F. These