The Genie 34439R.S Series II STB Extension Kit is a genuine Genie accessory designed to extend the reach of your Safe‑T‑Beam (STB) photoelectric safety sensors on garage door openers that use the Series II sensor system. Use this replacement/upgrade kit when the standard sensor leads are not long enough due to wide doors, high ceilings, or non‑standard wire routing. It supports residential Genie garage door openers equipped with Series II Safe‑T‑Beam technology and helps maintain proper obstruction detection by allowing correct placement and alignment of the photo eyes across the door opening.
This Series II Safe‑T‑Beam extension solution works with the low‑voltage, two‑conductor STB circuit common to Genie Series II operators; no programming changes are required, but the sensors must be properly aimed and installed per Genie instructions. Confirm that your opener specifies Series II Safe‑T‑Beam compatibility before purchase, as this kit is not universal and is not intended for other brands or Genie sensor generations. For installation, disconnect power, extend the sensor wiring run per the opener manual, secure wiring away from moving hardware, and verify sensor LEDs/door reversal after alignment. Use in typical residential applications on sectional or one‑piece doors to restore or extend safety sensor function while preserving required safety testing, including a final obstruction‑reversal check. Common search terms: Genie 34439R.S, Series II Safe‑T‑Beam extension, STB sensor wire extension, garage door opener safety sensor replacement, Genie photo eye extension kit.