Product Details

The SL-650QDP includes even more features to protect against false and missed alarms caused by mis-alignment and environmental issues. With 650ft. of outdoor detection range and 4-channel beam frequency selection, the QDP model is perfect for high security perimeter applications. New features include:

Dual modulation - Enhances signal discrimination against potential interferences

Quad beam - Dramatically cuts down on false alarms caused by birds and falling leaves

Sniper ViewFinder and Alignment Sound Assist - The new telescope lens on the SL Series has a high level of visibility for optical alignment work. Even at 650ft., a perfect installation and stable performance can be achieved in minimal time.

Sunshine Protection Technology - The SL Series has triple layer construction to allow for better performance against external light sources. (The sun, car headlights, mercury-vapor lamps and fluorescent lights)

Beam Power Control Selector - Allows you to manually adjust the beam power to help prevent crosstalk due to reflection, interference due to unstable signal or noise when using multiple beams over long distances, and allows the detector to be used in shorter than rated distances.

BAU-4 Compatible - The BAU-4 beam alignment unit automatically and accurately adjusts the optical access. This allows peak performance and gives one technician the ability to align a 350ft or 650ft SL detector without additional help.

SL-650QDP Dimensions
SL-650QDP Dimensions
  • Quad beam detection
  • Double modulated beam - enhances signal discrimination against potential interferences
  • Smart design
  • Slim body design
  • Easy-to-see vivid interior color for optical alignment
  • IP65 waterproof structure
  • Sniper Viewfinder® for easy alignment
  • 4 channel beam frequency selector
  • Alignment level indicator
  • Viewfinder with 2X magnification
  • Heater Option for cold climates (HU-3, sold separately)
  • UL/c-UL Listed
  • Beam interruption adjustment function
  • D.Q. circuit (environmental disqualification)
  • Tamper function
  • Beam power control selector
  • Alarm memory
  • Sound assist function
  • Optical alignment
  • Beam reception status
  • Walk test
  • Integrated Alignment Status Communication (I.A.S.C) to communicate the transmitter and receiver
  • BAU-4 Compatible (BAU-4 Automatic beam alignment tool sold separately)


  • Perimeter
  • Roof / Ceiling
  • Driveway

Key Features

  • 650ft. Outdoor 4-Channel Quad Photoelectric Detector
  • Double Modulation and Beam Power Control Selector
  • IP65 waterproof structure
  • Sniper Viewfinder® for easy alignment