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System Sensor P2WK 2-Wire Outdoor Horn/Strobe, Inc. W/P Backbox
System Sensor P2WK 2-Wire Outdoor Horn/Strobe, Inc. W/P Backbox

System Sensor P2WK 2-Wire Outdoor Horn/Strobe, Inc. W/P Backbox

Manufacturer:System Sensor
Manufacturer Part#:P2WK
Our Part#:P2WK
Stock Status: Call for Availability
Retail Price:$124.47
Your Savings:$37.34(30%)
Your Price:$87.13


System Sensor







Feature 5



  • Weatherproof per NEMA 4X, IP56
  • Listed to UL 1638 (strobe) and UL 464 (horn)
  • Compatible with System Sensor synchronization protocol and legacy SpectrAlert products
  • 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 horn tone and three volume selections
  • Horn rated at 88+ dBA at 16 volts
  • Rated from –40°F to 151°F
  • Universal mounting plate with an onboard shorting spring that tests wiring continuity before devices are installed
  • Plug-in design with minimal intrusion into the back box
  • Tamper-resistant construction


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.


Operating Temperature -40°F to 151°F (-40°C to 66°C)
Strobe Flash Rate 1 flash per second
Nominal Voltage Regulated 12 DC/FWR or regulated 24 DC/FWR1
Operating Voltage Range2 8 to 17.5 V (12V nominal) or 16 to 33 V (24 V nominal)
Input Terminal Wire Gauge 12 to 18 AWG
Wall-Mount Dimensions (including lens) 5.6" L x 4.7" W x 2.5" D (142 mm L x 119 mm W x 64 mm D)
Horn Dimensions 5.6" L x 4.7" W x 1.3" D (142 mm L x 119 mm W x 33 mm D)
Wall-Mount Weatherproof Back Box Dimensions (SA-WBB) 5.7" L x 5.1" W x 2.0" D (145 mm L x 130 mm W x 51 mm D)


1.Full Wave Rectified (FWR) voltage is a non-regulated, time-varying power source that is used on some power supply and panel outputs.
2. P, S, PC, and SC products will operate at 12 V nominal only for 15 and 15/75 cd.

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