Sears Craftsman 139.536670SRT1 Security+ 390 MHz Remote - 971LM Equivalent
This Sears Craftsman 139.536670SRT1 remote is commonly used as a LiftMaster 971LM equivalent for compatible 390 MHz Security+ systems. It is a one-button transmitter for operating one supported garage door opener, gate receiver, or compatible access channel.
The key fitment point is the red/orange learn button. This remote belongs to the older 390 MHz Security+ family and should not be confused with 315 MHz purple-button or yellow Security+ 2.0 remotes.
Compatibility and Application
Use this remote with compatible LiftMaster, Chamberlain, Craftsman, Raynor, and related Security+ 390 MHz openers or receivers that use a red or orange learn button. It is commonly cross-referenced with the LiftMaster 971LM and Chamberlain 950CB-style remote family.
This remote is not for yellow Security+ 2.0, purple 315 MHz Security+, green Billion Code, or DIP-switch-only receivers. Older openers should be checked carefully because age alone does not confirm the radio technology.
Features & Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster / Sears Craftsman compatible family |
| Product Type | 1-button remote control |
| Part Number | 139.536670SRT1 / 971LM equivalent |
| Application | Single compatible garage door opener, gate receiver, or access channel |
| Compatible Operator Type | Security+ 390 MHz LiftMaster-style systems |
| Security Technology | Security+ 390 MHz |
| Learn Button Color | Red or orange |
| Number of Buttons | 1 |
| Notes | Legacy 390 MHz Security+ remote family |
Also Known As / Related Part Numbers
- Sears Craftsman 139.536670SRT1
- LiftMaster 971LM equivalent
- Chamberlain 950CB related remote family
- Raynor 971RGD related remote family
- Commonly associated with red/orange learn button Security+ 390 MHz systems
Technician Note
This item is often ordered for older Craftsman and LiftMaster-family openers. Confirm the actual learn button color because a purple-button 315 MHz unit or yellow-button Security+ 2.0 unit will need a different remote.
Before Ordering
- Confirm a red or orange learn button on the opener or receiver.
- Use for one compatible 390 MHz Security+ access point.
- Do not order for purple 315 MHz or yellow Security+ 2.0 systems.
- Check whether the opener receiver memory is full if programming fails.
- Inspect the opener antenna wire if range is very short.
Professional Advisory
Older garage door and gate systems should still have working safety devices and proper force/travel adjustment. If the operator behaves unpredictably, stop using it and have it inspected before relying on a new remote.
Product Questions & Answers
What system does the 971LM equivalent work with?
It works with compatible Security+ 390 MHz systems that use a red or orange learn button.
Is this the same type of remote as a 371LM?
No. The 371LM is a 315 MHz purple-button remote, while the 971LM equivalent is for red/orange 390 MHz Security+ systems.
Can this remote replace Craftsman 139.536670SRT1?
Yes, this listing is intended for Sears Craftsman 139.536670SRT1-style Security+ 390 MHz applications when the opener or receiver is compatible.
Will this work with a yellow learn button opener?
No. Yellow learn button openers use Security+ 2.0 and require a compatible Security+ 2.0 remote.
What causes poor range on an older 390 MHz opener?
Weak batteries, antenna damage, local interference, or an aging receiver/control board can all cause poor range.
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