The System Sensor L-Series LED 2-Wire horn strobes are rich with features that increase application versatility, simplify installation, and maximize profits with lower current draw and modern aesthetics. LED lighting technology offers significantly lower current draw compared to older Xenon bulbs across a full candela range. This improves design flexibility for notification appliance circuits (NACs) while also reducing power supply requirements allowing for simpler and lower cost installations. All devices feature plug-in designs with minimal intrusion into the backbox, making installations fast and foolproof while virtually eliminating costly and time-consuming ground faults. To further simplify installation and protect devices from construction damage, the L-Series utilizes a universal mounting plate for all models with an onboard shorting spring, so installers can test wiring continuity before the device is installed. Installers can also easily adapt devices to suit a wide range of application requirements using field-selectable candela settings and a rotary switch for horn tones with two volume selections.