Description
Motorola PMMN4140B RM760 IMPRES Remote Speaker Microphone
Large-format IMPRES RSM with Windporting technology. 102 Phon loudness. IP68 Work-When-Wet. UL TIA-4950 Intrinsically Safe. 3.5mm audio jack. For R7, Ion, APX N-Series, and TETRA MXP portables.
The Motorola PMMN4140B (RM760) is a rugged, large-format IMPRES™ Remote Speaker Microphone engineered for professionals in demanding, high-noise environments. It delivers 102 Phon loudness to cut through heavy machinery, sirens, and crowded event noise, while Windporting technology eliminates wind howl for clear transmissions in severe weather. With an IP68 Work-When-Wet rating and UL TIA-4950 intrinsic safety certification, it is built for construction, public safety, maritime, and hazardous industrial operations. The PMMN4140B is the current-generation replacement for the PMMN4140 and PMMN4140A.
Key Features & Benefits
IMPRES™ Windporting Audio: Reduces wind howl and weather noise so the receiving party hears your voice, not the storm.
102 Phon Loudness: Oversized speaker delivers loud, crisp audio for high-noise environments such as construction sites and manufacturing floors.
IP68 Work-When-Wet: Submersible in 2 meters of water for up to 4 hours. Specialized drainage design prevents water from clogging the microphone membrane.
Intrinsically Safe: UL TIA-4950 certified for safe operation in potentially explosive or hazardous atmospheres.
3.5mm Audio Jack: Built-in non-threaded 3.5mm jack for a compatible receive-only earpiece for discreet listening.
Glove-Friendly Design: Large form factor is easy to operate with heavy work gloves. Includes a low-profile 360-degree swivel clip.
Specifications
| Attribute |
Details |
| Brand |
Motorola Solutions |
| Model / SKU |
PMMN4140B (RM760) |
| Replaces |
PMMN4140, PMMN4140A |
| Technology |
IMPRES™ Audio & Windporting |
| Loudness |
102 Phons |
| Ingress Protection |
IP68 Work-When-Wet (2m for 4 hours) |
| Intrinsic Safety |
UL TIA-4950 Certified |
| Audio Jack |
3.5mm Non-Threaded |
| Volume Knob |
None |
| Emergency Button |
None |
| Country of Origin |
Malaysia |
Compatibility
| Radio |
Series |
| R7, R7a |
Motorola MOTOTRBO R-Series |
| Ion |
Motorola MOTOTRBO Ion Smart Radio |
| APX N30, APX N50, APX N70 |
Motorola APX N-Series |
| MXP600, MXP660 |
Motorola TETRA Series |
Frequently Asked Questions
What is the difference between the PMMN4140A and the PMMN4140B?
The PMMN4140B is the current-generation revision of this microphone. It features updated internal components for improved reliability but looks and functions identically to the older PMMN4140 and PMMN4140A models.
What does "Work-When-Wet" mean?
Standard speaker mics can become muffled when water gets trapped in the speaker grill. The RM760 is engineered to instantly drain water from the housing, ensuring transmissions remain clear even immediately after submersion.
Does this microphone have a volume knob?
No. The RM760 (PMMN4140B) does not have a physical volume control, programmable button, or emergency button. If you require those controls, consider the Motorola RM780 (PMMN4128).
Related Accessories
Warranty
1-year manufacturer’s warranty.
