System Sensor SpectrAlert P2RK-R Outdoor Horn/Strobe​ with selectable strobe settings no back box

The SpectrAlert Advance P2RK-R (replacement model) is a red, two-wire, outdoor horn strobe with selectable strobe settings of 15, 15/75, 30, 75, 95, 110 and 115 cd. Offers mounting plate only - no back box included

SpectrAlert® Advance provides a full line of wall- and ceiling-mount devices for outdoor applications. These outdoor devices are designed to withstand harsher outdoor environments and include all the same time- and money-saving features as the rest of the SpectrAlert Advance line, including field-selectable candela settings, plug-in designs, rotary code switches, universal mounting plates, and the same current draw on wall- and ceiling-mount devices.

SpectrAlert Advance offers the broadest line of outdoor horns, strobes, and horn strobes in the industry. With white or red plastic housings, wall or ceiling mounting options, and plain or FIRE-printed devices, SpectrAlert Advance can meet virtually any application requirement, including indoor, outdoor, wet, and dry applications in temperatures from −40°F to 151°F. Like the entire SpectrAlert Advance line, outdoor horns, strobes, and horn strobes for wall applications include a variety of features that increase application flexibility and simplify installation. First, field-selectable settings, including candela, automatic selection of 12- or 24-volt operation, horn tones, and three volume options enable installers to easily adapt devices to meet requirements. Next, SpectrAlert Advance devices use a universal mounting plate for both wall and ceiling applications. This mounting plate includes an onboard shorting spring that ensures wiring continuity before devices are installed, so installers can verify proper wiring without mounting the devices and exposing them to potential construction damage. Once the plates are mounted, all SpectrAlert Advance devices utilize a plug-in design with a single captured screw to speed installation and virtually eliminate costly ground faults. Outdoor devices ship with weatherproof plastic back boxes (metal back boxes are available separately) that accommodate in-and-out wiring for daisy chaining devices. Plastic back boxes feature removable side flanges and improved resistance to saltwater corrosion. Knock-outs located on the back eliminate the need to drill holes for screw-in mounting. Plastic and metal weatherproof back boxes come with ¾‑inch top and bottom conduit entries and ¾‑inch knock-outs at the back. A screw-in NPT plug with an O-ring gasket for a watertight seal is included with each back box.