Product Overview
This replacement alarm buzzer is used on select Mighty Mule DC gate opener control board assemblies to provide audible warning or fault indication. On compatible systems, the buzzer may sound during specific fault conditions, battery warnings, or safety-related alerts controlled by the board.
Alarm buzzers are often replaced when the sounder is physically damaged, no longer produces sound when the board calls for an alert, or has been removed during prior service. However, replacing or disconnecting the buzzer is not the right repair for a system that is beeping because of an active fault.
The item in this CSV uses the generic mfgid 'Alarm,' so it should be treated as a service alarm/buzzer part and manually verified against the operator board and parts diagram. Some newer Mighty Mule operators use different alarm references, and not all alarm buzzers are interchangeable.
Compatible With
This part is commonly associated with the following Mighty Mule, GTO, and Linear PRO applications. Always match the part number, operator model, and parts diagram before ordering because older and newer generations may use similar-looking parts.
- Mighty Mule FM350 control board applications where this style alarm/buzzer is specified
- Mighty Mule FM500 and FM502 control board applications where this style alarm/buzzer is specified
- Mighty Mule FM600 control board applications where this style alarm/buzzer is specified
- Select Mighty Mule DC operator control boards using a separate audible alarm/buzzer connection
- Related to 12V DC alarm buzzer service parts such as R4622 where confirmed by board and parts diagram
- Not the same as newer RP1009 alarm applications unless confirmed by model
Features and Specifications
| Manufacturer | Linear / Mighty Mule / GTO |
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| Product Type | Replacement alarm buzzer |
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| Part Number | Alarm listed in source CSV; verify exact manufacturer part number |
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| Application | Audible warning/fault buzzer for select DC gate operators |
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| Voltage | Low-voltage DC alarm circuit; commonly associated with 12V DC systems |
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| Compatible Operator Type | Select Mighty Mule DC swing gate operators |
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| Notes | Do not bypass the alarm to silence a fault condition |
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Also Known As / Related Part Numbers
- Alarm
- Mighty Mule alarm buzzer
- FM600 alarm buzzer
- FM350 alarm buzzer
- FM500 alarm buzzer
- FM502 alarm buzzer
- R4622 related 12V alarm service part where confirmed
- RP1009 related newer alarm reference, not assumed interchangeable
Technician Note
If an operator is beeping, find the cause before replacing the buzzer. Low battery, charging failure, obstruction sensing, safety input faults, and board problems can all trigger audible warnings.
Before Ordering
- Confirm the exact alarm/buzzer part number from the original part or board diagram.
- Match the control board model and operator generation.
- Do not remove or bypass the buzzer to hide an active fault.
- Check battery and charging system if the alarm is sounding repeatedly.
- Confirm the connector style and mounting location before ordering.
Important Ordering Warnings
- This row should be manually reviewed because the mfgid is generic rather than a full manufacturer part number.
- Do not disable audible warning devices to keep a gate operating.
Professional Advisory
A gate operator that is sounding alarms or moving unpredictably should be diagnosed before continued use. If safety devices are missing or the alarm relates to an entrapment condition, use a qualified gate technician.
Product Questions and Answers
Is this buzzer used to silence a beeping gate opener?
No. A beeping operator usually indicates a condition that should be diagnosed. The buzzer should not be bypassed to silence a fault.
Which models is this alarm commonly associated with?
It is commonly associated with FM350, FM500, FM502, and FM600 control board applications where this alarm/buzzer style is specified.
Is Alarm the full manufacturer part number?
No. The CSV lists a generic mfgid of Alarm, so the exact part number should be verified before upload or ordering.
Can a bad battery make the alarm sound?
Yes. Low battery or charging problems can trigger audible alerts on many gate operator systems.
Is this the same as RP1009?
Not automatically. RP1009 is associated with newer Mighty Mule models, so do not treat it as interchangeable unless the parts diagram confirms it.
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