Liftmaster Chamberlain 975lm Laser Parking Assist A pulsating beam turns on for 90 seconds when the IR beam is interrupted. The driver pulls the car in until the red dot from the laser hits a pre-targeted spot on their dash. Simply connects to the photo-eye (IR) terminals of any LiftMaster Garage Door Opener. Two laser parking accessories may be installed with each garage door opener. Class 2 laser is safe on the eyes, yet clearly visible.