Check the listing for details. Liftmaster 50-HERK2 Motion Detector Separately Vehicle Detection Sensing System. Condition: New. Listed at 535.00 USD. Liftmaster 50-HERK2 Motion Detector Separately Vehicle Detection Sensing System Liftmaster 50-HERK2 Motion Detector Separately Vehicle Detection Sensing SystemLiftmaster 50-HERK2 Motion Detector Opens after sensing an object. - Can be set up to detect vehicles separately from people and bring the two signals to two different outputs - Or, use the two outputs to differentiate between forward and backward movements - Detection fields are adjustable - manually or with a remote control - Can be mounted between 8.2' up to 23', with max range of 80' - Reference height of 23' and angle of 45 degrees - Detection field is 20' x 16' NOTE: Requires 24-volt power supply separate from operator.https://youtu.be/JRACOZgiZQU Payments & Returns Policy