Dual encoder replacement motor assembly for the belt drive and chain drive model garage door openers listed below. 

• Motor Assembly includes: Motor, Optical Encoder with cover (RPM Sensor), the wiring harness for the motor and encoder, and instruction sheet 
• Genuine Genie replacement part 
• Compatible with models: 3024, 4024, 3022, 3042, 4022, 4042
• Replaces 38727A.S