DESC: ADEMCOs powerful 5803LST is a combination wireless photoelectric smoke&heat detector that trips when temperatures reach 135 F. Ideal for difficult to wire locations, situations where room aesthetics are critical or where hazardous materials exist, the 5803LST provides the ultimate in installation flexibility. Remarkably cost-effective, the attractive, low profile unit blends easily with any dcor&provides benefits rarely found in smoke detectors in this price range. Smart Check remote maintenance reporting automatically alerts the central station when it is in need of service&built-in drift compensation continuously corrects sensitivity variances caused by dust. The 5803LST is UL 268 listed for use in both commercial&residential applications.Features:* Low profile housing* Extended battery life - Two 3-volt Lithium* Automatic drift compensation* Smart Check - Pre-alarm maintenance signal* Test/alarm silence button - immediate signal 2.5 sec delay horn activation* Field replaceable cha