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Sensor Type
Contact Closure / Relay
Infrared (IR)
Normal State
Normally Closed
Normally Open
Ease of Installation
Intermediate (Installs < 60 minutes)
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Protect your Property from Criminals and Vandals with a Perimeter-style Security Sensor
Enforcer E-964-D390Q Twin Photobeam Detector, 390 Foot Range
SECO-LARM Enforcer E-964-D390Q Twin Photobeam Detector, 390 Foot Range
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Sample Installation Diagrams Interior View Vertical and Horizontal Adjustments
SECO-LARM Enforcer E-964-D390Q Twin Photobeam Detector, 390 Foot Range
Item# 77400
Price: Normally $173.99 
Hot Deal $143.75
Free shipping on orders over $50 - See Details


  • Two infrared beams provide reliable perimeter security
  • Weatherproof design
  • Outdoor range up to 390 feet
  • Quick, easy installation with built-in laser beam alignment system
  • Adjustable frequency and interruption time
  • Built-in Normally Open and Normally Closed relay output

Essential Info

An ultra-reliable security system means more than just monitoring possible entry ways into your home or business, it also means monitoring the perimeter of your property. The Enforcer Twin Photobeam Detector uses two infrared beams of light to create a detection barrier up to 390 feet in length when used outdoor (up to 790 feet indoor). This is ideal for use in monitoring your property line. The Twin Photobeam Detector features weatherproof construction, sunlight-filtering, anti-frost system and a built-in heater, making this product the perfect outdoor solution built to withstand harsh environmental conditions. The built-in laser beam alignment system decreases installation time while providing accurate, reliable positioning and extended range of the detector. There is even an LED alignment indicator to assist you with the setup. The lensed optics reinforce beam strength and provide excellent immunity to false alarms due to falling leaves, birds, inclement weather, etc., and the interruption time is adjustable for nearly all situations. It also offers normally closed (N/C) / normally open (N/O) alarm outputs in addition to a normally closed tamper circuit that can be used to communicate with your security system. Lastly, a selectable 4-channel beam frequency allows the sensor beam frequency to be set at different levels to avoid interference from other photobeam sensors that may be installed nearby.


What's Included

  • 1x - Enforcer Twin Photobeam Detector Transmitter
  • 1x - Enforcer Twin Photobeam Detector Receiver
  • 2x - Mounting plates
  • 2x - Sets of Pole Mounting Brackets
  • Mounting Hardware
  • 1x - Owner's Manual
  • More Info

    Adjusting the Delay Time
    The delay time adjustment knob sets how long the beam can be interrupted before triggering the alarm. A short delay time (high sensitivity) is suitable for catching fast moving intruders, but more susceptible to false alarms. A long delay time (low sensitivity) reduces false alarms, but fast moving intruders may not trigger the sensor.

    Running the Wires
    Run a cable from the alarm control panel to the photobeam sensor. If burying the cable is required, make sure to use electrical conduit; 22-Gauge, 20-Guage, 18-Guage, or 17-Guage shielded cable is strongly suggested.



    Manufacturer Product No.: E-964-D390Q
    Dimensions:6.8 inches x 2.9 inches x 2.8 inches (173 millimeters x 74 millimeters x 72 millimeters)
    Weight:2.5 pounds (1.1 kilograms)
    Maximum Outdoor Range:390 feet (120 meters)
    Maximum Indoor Range:790 feet (240 meter)
    Power:12 ~ 12 VAC/VDC (non-polarized)
    Detection Method:Simultaneous break of 2 beams
    Interrupt Speed:50msec ~ 700msec (variable)
    Alarm Output:NO./NC. relay, 1A @ 120VAC
    Tamper Output:NC switch, 1A @ 120VAC
    Alarm LED (Receiver):Red LED - ON: When transmitter and receiver are not aligned or when beam is broken
    Signal LED (Receiver):Yellow LED - ON: When receiver's signal is weak or when beam is broken
    Power LED (Tx and Rx):Green LED ON: Indicates connected to power
    Laser Wavelength:650nm
    Laser Output Power:< or = to 5mW
    Alignment Angle:Horizontal: +/-90°, Vertical: +/-5°
    Materials:PC Resin
    Operating Temperature:-13° F to 131° F (-25° C to 55° C)
    Certifications:CE, RoHS
    Warranty:Manufacturer one (1) year

    Important notes:
    Defective exchanges for identical item within 30 days of purchase. After 30 days, please contact the manufacturer.
    Manufacturer contact information: SECO-LARM USA Inc, Tel: (949) 261-2999


    Sample Installation Diagrams  Interior View  Vertical and Horizontal Adjustments   
    Sample Installation Diagrams  Interior View  Vertical and Horizontal Adjustments   



    4 Cond 22-ga Shielded Cable, 1000 Ft       
    4 Cond 22-ga Shielded Cable, 1000 Ft       

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