System Sensor P2WH-LF 2-Wire Low Frequency Sounder Strobe, High CD, White (Temporary Replacement for P2WL-LF) Features 520 Hz ± 10% square wave tone, NFPA compliance Full candela range plus High/Low tone options to optimize current draw for a wide variety of applications Field-selectable candela settings: 15, 30, 75, 95, 110, 135, and 185 Field-selectable candela settings. Wall units: 15, 30, 75, 95, 110, 135, and 185. Ceiling units: 15, 30, 75, 95, 115, 150, and 177 Rotary switch for High/Low, Temp3, Temp4, and Continuous settings. Sounder-only models also offer a Coded setting. Plug-in design with minimal intrusion into the back box Mounting plate shorting spring checks wiring continuity before device installation Electrically compatible with legacy SpectrAlert and SpectrAlert Advance devices (Direct replacement for HW/R-LF and P2R/WH-LF) Compatible with MDL3 sync module Sounders listed for ceiling and wall