The Optical Encoder is also known as the RPM sensor. The 39155R.S is used in certain model Genie screw drive garage door openers. (See below list for compatibility by model) Replacing this part may resolve any issue of short traveling problems or limits drifting on the garage door opener.

• Compatible with models; TriloG™1200 (3064), TriloG™ 1500 (4064), PowerMax® 1200 (3062), MachForce (4063), PowerMax® 1500, Excelerator® 1000, Excelerator® II (4062)
• Genuine Genie Replacement Part