System Sensor L-Series selectable output speaker strobes and dual-voltage evacuation speakers can reduce ground faults and enable faster installation with lower current draw and modern aesthetics.Features Plug-in design and protective cover reduce ground faults Universal mounting plate with an onboard shorting spring tests wiring continuity before installation No extension ring required Field selectable candela settings on wall units: 15, 30, 75, 95, 110, 135, 185 Automatic selection of 12- or 24-volt operation at 15 and 30 candela Rotary switch simplifies field selection of speaker voltage (25 and 70.7 Vrms) and power settings (¼, ½, 1 and 2 watts) Seakers offer high fidelity and high volume sound output Compatible with System Sensor synchronization protocol Electrical compatibility with existing SpectrAlert and SpectrAlert Advance products Tamper-resistant construction Updated modern aesthetics