Description
Motorola PMMN4131B IMPRES RM730 Small Remote Speaker Microphone
Compact IP68 submersible RSM with Windporting, 99 Phon audio, and emergency button for MOTOTRBO R7, R7a, ION, MXP600, and MXP660.
The Motorola PMMN4131B, also known as the RM730, is a compact IMPRES remote speaker microphone engineered for professionals who need reliable, high-volume audio in demanding field environments. Its slim, low-profile design minimizes clothing snag points and sits close to the chest panel without sacrificing acoustic power — making it ideal for public safety personnel, utility workers, heavy manufacturing, and security teams.
The PMMN4131B integrates Windporting technology to block wind distortion and rapidly shed rainwater, keeping the internal acoustic chamber clear during outdoor operations. A built-in 3.5mm non-threaded mono audio jack supports optional receive-only earpieces for silent, confidential message monitoring. The prominent orange emergency button on top of the housing enables rapid emergency signaling without fumbling for the radio.
Rated IP68 — completely dust-tight and waterproof, remaining fully operational after immersion in up to 2 meters of water for 4 hours. The PMMN4131B is the current factory-authorized revision of the legacy PMMN4131 and uses a specialized low-profile multi-pin side connector designed for next-generation MOTOTRBO platforms.
Key Features & Benefits
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IMPRES™ Intelligent Audio: Automatically balances audio gain levels for optimized voice clarity across varying ambient noise conditions.
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IP68 Submersible: Completely dust-tight and waterproof — fully operational after immersion in up to 2 meters of water for 4 hours.
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Windporting Technology: Channels air away from the microphone core to eliminate wind roar distortion and prevent water logging during heavy rain.
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99 Phon Loud Speaker: High-output speaker delivers powerful, intelligible audio to cut through loud background noise on job sites, in vehicles, and in public venues.
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Orange Emergency Button: Prominent, high-visibility emergency button on top of the housing for rapid emergency signaling without reaching for the radio.
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360-Degree Swivel Clip: Heavy-duty rotating garment clip anchors the microphone flat against tactical vests, uniform straps, or epaulettes.
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3.5mm Non-Threaded Audio Jack: Accepts standard 3.5mm mono earpiece plugs for silent, confidential receive-only monitoring.
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Compact Low-Profile Design: Slim housing minimizes snag points and sits close to the chest panel for comfortable all-day wear.
Specifications
| Attribute |
Details |
| Brand |
Motorola |
| Model / SKU |
PMMN4131B (also PMMN4131 / RM730) |
| Product Type |
Small Remote Speaker Microphone (RSM) |
| Audio Technology |
IMPRES™ Intelligent Audio, Windporting |
| IP Rating |
IP68 (2m / 4 hours) |
| Audio Output |
99 Phon |
| Audio Jack |
3.5mm Non-Threaded Mono |
| Emergency Button |
Yes — Orange, Top-Mounted |
| Clip Style |
360-Degree Swivel Clip |
| Dimensions |
2.75 × 2.16 × 0.86 in |
| Weight |
0.18 lbs |
| Color |
Black |
| Country of Origin |
Malaysia |
Compatibility
| Model |
Series |
|
R7, R7a |
Motorola R Series |
| ION |
Motorola ION Series |
| MXP600, MXP660 |
Motorola MXP Series |
What's Included
| Description |
SKU/Model |
Status |
| Compact Remote Speaker Microphone |
PMMN4131B |
Included |
| 360-Degree Rotating Garment Clip |
Integrated |
Included |
| Compatible Portable Two-Way Radio |
— |
Sold Separately |
| Listen-Only Earpiece |
— |
Sold Separately |
Recommended Accessories
Compatible Radios
Motorola MOTOTRBO R7 Portable Two-Way Radio — Premium MOTOTRBO digital portable that natively pairs with the PMMN4131B low-profile side connector.
Motorola MOTOTRBO Ion Portable Smart Radio — Android-powered smart radio compatible with the PMMN4131B.
More Resources
Frequently Asked Questions
Can the integrated 3.5mm audio jack accommodate threaded earpiece plugs?
No. The built-in auxiliary audio port on the PMMN4131B is a standard non-threaded mono receiver jack designed to accept universal slide-in 3.5mm earpiece plugs. It does not support threaded connectors.
How does Windporting benefit workers during outdoor use?
Windporting channels air away from the acoustic microphone core to eliminate the roaring distortion caused by high winds, while also preventing water logging during heavy rain. This ensures clear voice transmission in outdoor environments where standard RSMs typically struggle.
Is the PMMN4131B backwards compatible with legacy MOTOTRBO radios?
No. The PMMN4131B uses a specialized low-profile multi-pin side connector designed for next-generation MOTOTRBO platforms including the R7, R7a, ION, MXP600, and MXP660. It does not connect to legacy MOTOTRBO side accessory ports.
What is the difference between the PMMN4131 and PMMN4131B?
The PMMN4131B is the current factory-authorized revision of the legacy PMMN4131, offering updated materials and improved performance. Both part numbers refer to the same IMPRES RM730 small remote speaker microphone.
Warranty
1-year manufacturer’s warranty.
