LiftMaster 971LM 390MHz Remote Control
The 971LM is a single-button remote from LiftMaster's older 390MHz Security+ remote family. It is typically used to operate one compatible garage door opener, gate receiver, or Sears Craftsman opener using the same 390MHz rolling-code platform. Customers usually look for this remote when an older transmitter has a broken case, worn button, weak range, missing battery clip, or has been lost. The key compatibility detail is that 971LM is not a Security+ 2.0 yellow learn button remote and is not a 315MHz purple-button remote. It belongs to the legacy 390MHz Security+ group, commonly associated with red/orange learn button openers. Some modern universal or MAX remotes may replace it in certain installations, but the existing operator or receiver must still be able to learn that replacement transmitter.
Compatible With
- Select LiftMaster 390MHz Security+ garage door openers
- Select Chamberlain 390MHz Security+ garage door openers
- Select Sears Craftsman 390MHz Security+ openers including 139.536670SRT1 style references
- Commonly associated with red/orange learn button systems
- May be used with compatible 390MHz Security+ gate receivers
- Not for yellow learn button Security+ 2.0 systems, purple 315MHz systems, green learn button systems, or DIP-switch-only systems
Compatibility note: Use the installed opener, receiver, access-control system, or replacement parts diagram as the final match. Similar LiftMaster part numbers can have different frequency, security technology, connector, cabinet, or generation requirements.
Features and Specifications
| Manufacturer | LiftMaster |
|---|
| Product Type | 1-button remote control |
|---|
| Part Number | 971LM |
|---|
| Application | Legacy 390MHz Security+ garage and receiver applications |
|---|
| Frequency | 390 MHz |
|---|
| Security Technology | Security+ rolling code |
|---|
| Learn Button Color | Typically red/orange on compatible openers |
|---|
| Notes | Match the existing opener or receiver radio system before ordering |
|---|
Also Known As / Related Part Numbers
- 971LM
- 139.536670SRT1
- Sears Craftsman 139.536670SRT1
- LiftMaster 971LM equivalent
- 390MHz Security+ remote
- 1-button Security+ remote
- 971LM transmitter
Technician Note
Most ordering mistakes with this item happen when the part is matched only by appearance or brand name. Check the model number, learn button color, receiver model, system generation, and original part number before ordering.
Before Ordering Checklist
- Verify the exact manufacturer part number on the original part or parts diagram.
- Confirm the opener, receiver, keypad, gate operator, or access-control model.
- Check frequency, security technology, voltage, connector layout, and generation where applicable.
- Do not assume similar-looking LiftMaster parts are interchangeable.
- For safety devices and electrical parts, inspect the full system for wiring damage, moisture, corrosion, or unsafe operation.
Professional Advisory
Programming and compatibility depend on the installed opener, receiver, or access-control system. If the system has damaged wiring, poor range, intermittent operation, or unknown receiver technology, confirm the cause before replacing the remote or control.
Product Questions and Answers
What frequency is the 971LM?
The 971LM is a 390MHz Security+ remote control for compatible legacy LiftMaster, Chamberlain, and Sears Craftsman systems.
Is the 971LM for yellow learn button openers?
No. Yellow learn button openers use Security+ 2.0 technology and require a different compatible remote family.
What Sears Craftsman number is commonly associated with 971LM?
One common related reference is Sears Craftsman 139.536670SRT1, which is often described as a 971LM equivalent for 390MHz Security+ systems.
Can a newer MAX remote replace this remote?
In some installations a compatible MAX-series remote may be programmed as a replacement, but the opener or receiver learn button color and radio platform should be checked first.
What should I verify before ordering a 971LM?
Verify the opener brand, model, learn button color, and whether the existing system is truly 390MHz Security+ rather than 315MHz, Security+ 2.0, or DIP-switch technology.
