Active beam detectors. These alarm devices snd an active singe, dual or quad beam to a receiver. They require line of sight. When the beams are interupted or broken the detector will go into alarm. The are ideal for virtual fences or across driveways to detect intruders
Active Beams
Takex

Takex Reflector Beam: Up to 30m Outdoor / 40m Indoor
GJD

GJD GJD940 Active Edge Dual Infrared Beams 60m Ext / 180m Int
Takex

Takex 1m Reflector Beam System (no reflector req)
Takex

Takex 60m Ext / 120m Int Twin Actve Beam White
Takex

Takex Miniature Double IR Beam with Control Unit
GJD

GJD 200m Quad Infrared Beams GJD970
GJD
GJD GJD960 Active Edge Dual Infrared Beams 60m Ext / 180m Int
Optex

Optex 4 Channel 100m Twin Active Beam
Product is obsolete.
Optex

Product is obsolete.
Optex

Product is obsolete.
Optex

Optex Synchronised 30m Twin Active Beam
Product is obsolete.
Risco