Description
Motorola PMMN4140A RM760 IMPRES Remote Speaker Microphone
The Motorola PMMN4140B (also known as the RM760) is a rugged, large-format IMPRES™ Remote Speaker Microphone (RSM) designed for professionals working in demanding, high-noise environments. Engineered to deliver uncompromising audio clarity, the RM760 performs at a massive 102 Phon loudness, ensuring your voice punches through heavy machinery, sirens, and crowded event noise.
Equipped with Motorola's exclusive Windporting technology and a "Work-When-Wet" IP68 submersible rating, this microphone is designed to instantly drain water to guarantee clear communication during heavy rain, severe weather, or maritime operations. It is also fully UL TIA-4950 certified for intrinsic safety in hazardous environments. (Note: The PMMN4140B is the official, updated OEM replacement for the previous-generation PMMN4140 and PMMN4140A).
Key Features & Benefits
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IMPRES™ Windporting Audio: Dramatically reduces the howling and whining noise associated with high winds and harsh weather, ensuring the receiving party hears you, not the storm.
-
102 Phon Loudness: An oversized speaker delivers incredibly loud and crisp audio for high-noise work environments like construction sites and manufacturing floors.
- Work-When-Wet IP68 Rating: Fully dustproof and submersible in 2 meters of water for up to 4 hours. A specialized drainage design prevents water from clogging the microphone membrane.
- Intrinsically Safe: UL TIA-4950 certified for safe operation in environments with potentially explosive or hazardous materials.
- Discreet Listening: Features a built-in 3.5mm non-threaded audio jack, allowing you to plug in a compatible receive-only earpiece for private communications.
- Ergonomic Design: The large form factor is easy to operate even while wearing heavy work gloves, and it includes a low-profile 360-degree swivel clip to keep the mic securely fastened close to your body.
Technical Specifications
| Feature |
Specification |
| Model Number |
Motorola PMMN4140A (RM760) |
| Technology |
IMPRES™ Audio & Windporting |
| IP Rating |
IP68 (Submersible & Work-When-Wet) |
| Intrinsic Safety |
UL TIA-4950 Certified |
| Audio Jack |
3.5mm (Non-Threaded) |
| Loudness |
102 Phons |
| Physical Controls |
No Volume Knob, No Emergency Button |
| Warranty |
1-Year Manufacturer's Warranty |
Hardware Compatibility
The Motorola PMMN4140A RM760 utilizes a specialized multi-pin connector designed specifically for the latest generation of Motorola professional portables. It is fully compatible with:
-
MOTOTRBO R-Series: R7, R7a
- MOTOTRBO Ion: Smart Android Radio
- APX N-Series: APX N30, APX N50, APX N70
- TETRA Series: MXP600, MXP660
Frequently Asked Questions (FAQs)
What is the difference between the PMMN4140A and the PMMN4140B? The PMMN4140B is the newest, current-generation revision of this microphone from Motorola. It features updated internal components for better reliability but looks and functions identically to the older PMMN4140(A) model.
What does "Work-When-Wet" mean? Standard speaker mics can become muffled and hard to hear when water gets trapped in the speaker grill. The RM760 is engineered to instantly drain water out of the housing, ensuring your transmissions remain crystal clear even immediately after the microphone is submerged.
Does this microphone have a volume knob? No, the RM760 (PMMN4140A) does not feature a physical volume control, programmable button, or emergency button on the housing. If you require those specific physical controls on the mic, we recommend upgrading to the Motorola RM780 (PMMN4128).
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