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The 449CST is a self diagnostic photoelectric smoke detector from GE Security that is designed to promote high operation and use within a variety of setups for easy detection of smoke within an area. The 449CST smoke detector comes with a plug-in terminal block, a 6.1-inch detector head diameter, a 135.0 °F fixed heat detection rate, a field-replaceable optical chamber, an on-site maintenance alert, as well as a white colored appearance. The 449CST smoke detector also features a low profile design, a 1.85-inch detector head depth, a test and hush feature, advanced false alarm immunity, plus intelligent self diagnostics. This smoke detector is designed to promote a quality operation, and can be used in a number of areas where a high traffic of people may reside on a day to day basis.