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The System Sensor MWBB is a red, wall-mounted, metal, weatherproof backbox. Also, the System Sensor is a metal outdoor back box for speakers and speaker strobes. Features • Weatherproof per NEMA 4X, IP56 • Rated from -40°F to 151°F • Plug-in design reduces ground faults • Universal mounting plate with onboard shorting spring that tests wiring continuity before devices are installed • Field-selectable candela settings: 15, 15/75, 30, 75, 95, 110, 115, 135, 150, 177, and 185 • Automatic selection of 12- or 24-volt operation at 15 and 15/75 candela • Rotary switch for speaker voltage (25 and 70.7 Vrms) and power settings (1/4, 1/2, 1 and 2 watts) • Compatible with System Sensor synchronization protocol and legacy SpectrAlert products • Tamper-resistant construction • Listed for ceiling or wall mounting