System Sensor L-Series audible visible notification products are rich with features guaranteed to cut installation times and maximize profits with lower current draw and modern aesthetics.Features Updated modern aesthetics Small profile devices for Horns and Horn Strobes Plug-in design with minimal intrusion into the back box Tamper-resistant construction Automatic selection of 12- or 24-volt operation at 15 and 30 candela Field-selectable candela settings on wall units: 15, 30, 75, 95, 110, 135, and 185 Horn rated at 88+ dBA at 16 volts Rotary switch for horn tone and two volume selections Mounting plate for all standard and wall units Mounting plate shorting spring checks wiring continuity before device installation Electrically compatible with legacy SpectrAlert and SpectrAlert Advance devices Compatible with MDL3A sync module Strobes and Horn Strobes listed for wall mounting only Horns listed for wall or ceiling use