P2RHK-120 Outdoor 120V Selectable Output Horn/Strobe

SpectrAlert® Advance

Model No. P2RHK-120

The SpectrAlert® Advance selectable-output outdoor 120V horn/strobe is rich with features guaranteed to cut installation times and maximize profits.


  • Plug-in design
  • Field selectable candela settings: 135, 150, 177, 185
  • Tamper resistant construction
  • Outdoor products rated from –40°F to 151°F
  • Regulated 120VAC
  • Rotary switch for horn tone and three volume selections
  • Outdoor products listed to UL 1638 (strobe) and UL 464 (horn) outdoor requirements
  • Outdoor products rainproof per UL 50 (NEMA 3R)
  • Weatherproof back box included
  • Single screw attachment
  • Horn/strobe, 120VAC adapter mounting plate, and weatherproof back box included
  • Listed for ceiling or wall mounting





The SpectrAlert Advance series of notification appliances is designed to simplify installations, with features such as plug in designs, instant feedback messages to ensure correct installation of individual devices, and field-selectable candela settings.

When installing the P2RHK-120, first attach the 120V mounting plate to the outdoor back box provided with each unit.

Next, connect the notification appliance circuit wiring to the SEMS terminals on the mounting plate.

Finally, attach the horn/strobe to the mounting plate by inserting the product’s tabs in the mounting plate’s grooves. The device will rotate into position, locking the product’s pins into the mounting plate’s terminals. The device will temporarily hold in place with a catch until it is secured with a captured mounting screw.

The SpectrAlert Advance series outdoor notification appliances are rated between minus 40 degrees Fahrenheit and 151 degrees Fahrenheit in wet or dry applications.

P2RHK-120 Dimensions
P2RHK-120 Mounting

SpectrAlert Advance Specifications

Architectural/Engineering Specifications

The horn/strobe shall be a System Sensor SpectrAlert Advance Model _______ listed to UL 1971 and UL 464 and shall be approved for fire protective service. The horn/strobe shall be wired as a primary-signaling notification appliance and comply with the Americans with Disabilities Act requirements for visible signaling appliances, flashing at 1Hz over the strobe’s entire operating voltage range. The strobe light shall consist of a xenon flash tube and associated lens/reflector system. The horn shall have three audibility options and an option to switch between a temporal three-pattern and a non-temporal (continuous) pattern. These options are set by a multiple position switch. On four-wire products, the strobe shall be powered independently of the sounder. The horn on horn/strobe models shall operate on a coded or non-coded power supply.

Outdoor Products

SpectrAlert Advance outdoor horn/strobe shall be listed for outdoor use by UL and shall operate between minus 40 degrees and 151 degrees Fahrenheit. The products shall be listed for use with a System Sensor outdoor/weatherproof back box with half inch and three-fourths inch conduit entries.

Physical Specifications
Operating Temperature

–40°F to 151°F (–40°C to 66°C)

Strobe Flash Rate

1 flash per second

Nominal Voltage

Regulated 120VAC

Operating Voltage Range

96 – 132VAC

Input terminal wire gauge

12 to 18AWG


5.7″L×5.1″W×2.0″D(145mmL × 130mmW × 51mmD)


Candela Derating
For K series products used at low temperatures, listed candela ratings must be reduced in accordance with this table.

Strobe Output (cd)
Listed CandelaCandela rating at –40°F

SpectrAlert Advance Ordering Information

P2RHK-120*2-wire Horn/Strobe, High cd, Red, Outdoor, 120VAC

*Includes P2RHK 2-wire horn/strobe, MP120K 120VAC adapter mounting plate, and weatherproof back box.
“High cd,” refers to strobes that include 135, 150, 177, and 185 candela settings.
All outdoor units ending in “K” include a weatherproof back box.