Description
Heavy-Duty Submersible Remote Speaker Microphone Line
Deliver extreme voice clarity, windporting noise reduction, and rugged IP68 protection.
The Motorola RM780 IMPRES Remote Speaker Microphone (RSM) line is a premium, heavy-duty wired audio accessory engineered for public safety officers, industrial technicians, emergency first responders, and field service crews. Built to withstand extreme operational environments, the RM780 features Motorola's advanced IMPRES audio processing and Windporting microphone architecture. This combination cancels loud ambient background noise from sirens, machinery, and gale-force winds while preventing water from clogging the microphone diaphragm.
Designed for maximum tactile usability, the RM780 features a large, glove-friendly form factor and a low-profile 360-degree swivel clip that keeps the microphone sitting close to your chest or lapel. Every RM780 model carries an IP68 dust-tight and submersible rating (water immersion up to 6 feet for 2 hours), integrated radio controls (including a dedicated orange emergency button and programmable side buttons), and a 3.5mm non-threaded audio jack for secondary receive-only earpieces.
Model Options
Select the RM780 configuration that matches your radio fleet's connector interface and regulatory safety requirements:
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PMMN4128B (HAZLOC / Multi-Pin Side Connector): Features Motorola's modern multi-pin side accessory connector designed for radios such as the R7, Ion, APXN Series, and MXP Series. It carries TIA4950 (UL) HazLoc certification for safe operation in explosive or hazardous industrial environments and includes a top volume rocker toggle, two programmable buttons, and an emergency button.
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PMMN4177A (GCAI Mini Connector): Features the compact GCAI Mini connector interface designed for radios utilizing that specific accessory connection. It provides the full RM780 core feature set—including IMPRES audio, windporting, IP68 submersibility, large housing, 3.5mm earpiece jack, emergency button, and programmable buttons—for non-HazLoc deployments.
Key Features & Benefits
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IMPRES Audio Intelligence: Automatically optimizes microphone gain, increases volume headroom, and cancels ambient noise for crisp, consistent voice transmissions in loud environments.
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Windporting Technology: Reduces howling wind noise in harsh weather and drains water instantly so voice audio remains clear after immersion.
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IP68 Submersible Durability: Certified dust-tight and submersible in up to 6 feet (2 meters) of water for 2 hours, ensuring "Work-When-Wet" field reliability.
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Large Glove-Friendly Housing: Ergonomically shaped with heavy textured grips to allow effortless operation while wearing thick work or fire gloves.
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Low-Profile Swivel Clip: Heavy-duty 360-degree rotating clothing clip keeps the microphone flush against your body to reduce snagging hazards.
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3.5mm Earpiece Audio Port: Integrated 3.5mm non-threaded side jack allows quick attachment of secondary receive-only earpieces for discrete channel monitoring.
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Integrated Radio Controls: Prominent orange emergency button and programmable shortcut buttons allow rapid tactical responses directly from the mic.
Model Comparison Matrix
| Feature / Attribute |
PMMN4128B |
PMMN4177A |
| Marketing Name |
RM780 IMPRES RSM (HAZLOC / Modern Side) |
RM780 IMPRES RSM (GCAI Mini) |
| Connector Type |
Modern Side Accessory Interface |
GCAI Mini Connector |
| Intrinsic Safety (HazLoc) |
TIA4950 (UL) Certified |
Standard (Non-HazLoc) |
| IP Rating |
IP68 Submersible (2m / 2h) |
IP68 Submersible (2m / 2h) |
| Audio Jack |
3.5mm Non-Threaded |
3.5mm Non-Threaded |
| Volume Control |
Top Volume Rocker Toggle |
Radio Controlled / Integrated |
| Emergency & Programmable Buttons |
Yes (Emergency + 2 Prog) |
Yes (Emergency + Programmable) |
Specifications
| Attribute |
Details |
| Brand |
Motorola Solutions |
| Product Family |
RM780 IMPRES Remote Speaker Microphone |
| Audio Technology |
IMPRES & Windporting |
| Ingress Protection |
IP68 Submersible (6 ft / 2 m for 2 hours) |
| Audio Jack |
3.5mm Non-Threaded Side Port |
| Mounting Clip |
Low-Profile 360-Degree Swivel Clip |
Compatibility
PMMN4128B (Multi-Pin Side Connector / HazLoc)
|
|
|
|
| APXN30 |
APXN50 |
APXN70 |
Ion |
| R7 |
R7a |
MXP600 |
MXP660 |
| MXP7000 |
|
|
|
PMMN4177A (GCAI Mini Connector)
|
|
|
|
| APXNEXT |
APXNEXT XE |
APXN70 (GCAI Mini) |
|
What's Included
| Description |
SKU/Model |
Status |
| RM780 IMPRES Remote Speaker Microphone |
PMMN4128B or PMMN4177A |
Included (Based on Selection) |
| Low-Profile Swivel Clothing Clip |
PMLN8121 |
Included (Pre-installed) |
Recommended Accessories
Secondary Earpieces
Field Replacement Parts (PMMN4128B)
Compatible Radios
More Resources
Frequently Asked Questions
What are the main differences between PMMN4128B and PMMN4177A?
Both options feature the core RM780 heavy-duty housing, IMPRES audio, windporting, IP68 submersibility, and 3.5mm jack. PMMN4128B features Motorola's modern multi-pin side connector with TIA4950 (UL) HazLoc certification for radios like the R7 and Ion. PMMN4177A utilizes a GCAI Mini connector interface for radios equipped with that specific accessory jack.
What does the IP68 submersibility rating guarantee for the RM780?
The IP68 rating certifies that the microphone is completely dust-tight and can be submerged in up to 6 feet (2 meters) of water for up to 2 hours without water intrusion or performance loss.
How does Windporting technology improve audio clarity?
Windporting acoustically filters out wind noise caused by severe weather or moving vehicles and prevents water from pooling over the microphone element, allowing voice audio to transmit clearly.
Can I connect a private earpiece to the RM780?
Yes, all RM780 models feature an integrated 3.5mm non-threaded audio port on the side of the housing, allowing quick attachment of receive-only earpieces such as the Motorola PMLN8120A.
Which model should I select for oil, gas, or chemical facilities?
You should select PMMN4128B, as it carries TIA4950 (UL) HazLoc certification for safe operation in explosive gas or dust atmospheres when paired with certified hazardous-location radios.
Warranty
1-year manufacturer's warranty.
