Genie Safe-T-Beam sensors are also known as safety eyes. The model GSTB-R, replacement safety beams make sure the door reverses automatically when an object passes through them for added safety. Compatible with all Genie residential garage door openers that use a Safe-T-Beam sensor system on any size door. The safety beam wiring included here can be easily replaced when it is broken. The extension brackets are great for situations when the Safe-T-Beams need to be further into the garage due to door placing issues.