Description
Rugged IP57 Submersible Remote Speaker Microphone with Noise Cancellation
Deliver clear, high-performance audio transmission in severe outdoor and heavy industrial job sites.
Technical Suffix & Revision Notice: In accordance with standard Motorola Solutions manufacturing guidelines, the suffix letter at the absolute end of an active product part number or engineering code (such as the "B" in MH-66F4B) designates the current factory engineering revision tier. When purchasing original equipment components, the manufacturer automatically fulfills and ships the latest available operational revision iteration (e.g., transitioning smoothly from an "A" to a "B" or "C" variant), which guarantees complete backward physical compatibility while incorporating the newest internal production enhancements.
The Motorola MH-66F4B (cross-referenced across commercial supply frameworks as the Motorola AAE46X509 or MH-664B) is a professional-grade, high-performance remote speaker microphone (RSM) built to withstand punishing tactical environments. Integrating this heavy-duty lapel microphone into your team's wireless infrastructure enables logistics staff, structural engineers, and security teams to communicate seamlessly without retrieving their portable transceivers from their belts. Designed with an ultra-rugged outer casing, this shoulder microphone combines structural durability with elite audio clarity.
Engineered to operate in unpredictable weather, the MH-66F4B features a certified IP57 dust and waterproof specification rating. This heavy-duty build allows the accessory to remain completely submerged in up to 3 feet of water for 30 consecutive minutes without suffering performance loss or internal circuit degradation. The integrated noise-canceling technical module filters out disruptive ambient background noise—such as heavy manufacturing machinery, high winds, and vehicle engines—transmitting only clear, crisp voice paths. A heavy-duty 360-degree rotating mounting clip allows personnel to securely fasten the housing to uniform lapels, safety vests, or equipment straps at any preferred angle.
Key Features & Benefits
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IP57 Submersible Architecture: Fully dustproof and waterproof construction designed to stay operational after being dropped or submerged in up to 3 feet of water for 30 minutes.
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Acoustic Noise-Canceling Core: Built-in microphone processing filters out loud wind and background industrial roar to deliver clear voice transmissions.
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Integrated 3.5mm Secondary Audio Jack: Features a sealed auxiliary output port to connect listen-only earpieces for private, secure communication in discreet environments.
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360-Degree Heavy-Duty Mounting Clip: Outfitted with a rugged, rotating clip mechanism that allows flexible positioning on uniform epaulets or utility vest straps.
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Coiled Strain-Relief Cable: Built with a resilient, high-flexibility cable layout that prevents tearing or line stretching during fast physical movements.
Specifications
| Attribute |
Details |
| Brand |
Motorola Solutions / Vertex Standard |
| Factory Kit Number |
AAE46X509 |
| Model Number |
MH-66F4B / MH-664B |
| Water & Dust Protection Rating |
IP57 Submersible (3 Feet for 30 Minutes) |
| Audio Feature Set |
Noise-Canceling Technology |
| Mounting Style |
360-Degree Rotating Spring Clip |
| Auxiliary Port |
Built-in Audio Earpiece Jack |
Compatibility
What’s Included
| Description |
SKU/Model |
Status |
| Motorola Submersible Noise-Canceling Remote Speaker Microphone |
MH-66F4B / AAE46X509 |
✅ Included |
| High-Flex Coiled Cord and 360-Degree Mechanical Mounting Latch |
Integrated Assembly |
✅ Included |
| Motorola EVX-S24 Ultra-Compact Digital Portable Handheld Radio |
EVX-S24 Series |
❌ Sold Separately |
Recommended Accessories
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Motorola EVX-S24 Compact Digital Two-Way Radio – The primary ultra-compact, pocket-sized portable transceiver that serves as the native host radio for this waterproof multi-pin screw-on connector assembly.
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Motorola PMLN7560A Receive-Only Earpiece – A professional-grade surveillance earpiece with a low-visibility translucent acoustic tube that plugs directly into the speaker microphone’s integrated unthreaded 3.5mm jack for private, confidential message monitoring.
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Motorola CD-66 Enhanced Charging Cradle (AAM20X501) – The official dual-pocket desktop drop-in charging well engineered to simultaneously replenish your EVX-S24 radio chassis and a secondary spare battery pack during downtime.
More Resources
Frequently Asked Questions
Why does my microphone have a different trailing letter at the end of the part number than what is listed?
The letter at the absolute end of a Motorola part number (such as the "B" in MH-66F4B) represents the current factory engineering revision tier. As Motorola implements minor manufacturing updates or component enhancements, they increment this letter (e.g., from A to B, or B to C). Regardless of the trailing letter you receive, the base part is physically identical, 100% backward compatible, and fully authorized by the manufacturer for your radio.
What is the exact difference between the MH-66F4B model and the AAE46X509 part number?
They refer to the exact same physical hardware accessory. MH-66F4B is the legacy hardware model number originally established under the Vertex Standard catalog, while AAE46X509 is the official global fulfillment kit SKU used by Motorola Solutions following their system integration.
Does the built-in secondary audio jack support two-way transmission headsets?
No. The auxiliary port on the side of the microphone casing is a dedicated, receive-only audio jack. It is designed to accept standard listen-only earpieces, routing incoming voice messages directly to your ear while still requiring you to use the main microphone push-to-talk button to transmit.
Can I submerge the microphone in water if an earpiece is plugged into the audio jack?
To preserve the full IP57 waterproof and submersible protection rating, the side audio jack must be completely sealed by its integrated rubber protective flap. Plugging an accessory into the port exposes the terminal pins to direct liquid contact and voids the submersible rating.
Is this remote speaker microphone compatible with high-tier APX or MOTOTRBO radios?
No. The MH-66F4B / AAE46X509 uses a specialized screw-on multi-pin connector plug custom-molded to match the slim profile of the EVX-S24 pocket radio series. It will not fit or interface with larger commercial radio connections.
How does the automatic noise-canceling feature function during high winds?
The microphone casing houses a dual-port acoustic chamber that naturally balances out ambient atmospheric pressures caused by heavy winds or loud machinery roar, preventing the internal diaphragm from clipping and ensuring clean, intelligible voice delivery.
What type of replacement coverage protects this ruggedized lapel microphone?
This authentic original equipment manufacturer portable accessory arrives fully backed against unexpected internal circuit failures, material anomalies, or assembly line defects under a standard 1-year factory warranty policy.
Warranty
1-year manufacturer’s warranty.
