Motor assembly replacement for Genie belt drive and chain drive 24V model garage door openers listed below. 

• Motor Assembly includes: Motor, Optical Encoder with wheel and cover (RPM Sensor), the wiring harness, installation screws, and instruction sheet 
• Genuine Genie replacement part 
• Compatible with models: 3120H, 3120H-B, 3120HL, 3120HL-B
• Replaces old part number 39730R.S