Why Specialised Microphones Matter
Unlike a microphone built for recording music or podcasts, a communication microphone is engineered with one goal: vocal clarity. Nothing else comes close. They're built tough to handle rain, dust, and hard knocks, while excelling at capturing the human voice and filtering out everything else.
Whether it's a lapel mic for discreet use, a rugged RSM clipped to a safety vest, or a fixed mic in a PA system, the design is always laser-focused on intelligibility. A crystal-clear instruction through a noise-cancelling headset can prevent an accident on a busy worksite. A waterproof microphone ensures emergency services stay connected during a rescue in rough weather.
Remote Speaker Microphones
A Remote Speaker Microphone (RSM) bundles a speaker, microphone, and Push-to-Talk button into one compact unit worn on your shoulder or chest, instead of fumbling for the radio itself. Your expensive radio stays clipped away, shielded from knocks, while communication becomes quicker and more natural.
What Separates a Good RSM
- Oversized PTT buttons: easy to find and press even with thick work gloves on.
- Dedicated emergency buttons: a programmable orange or red button on many top-tier models allows instant emergency alerts.
- Accessory jacks: a standard 3.5mm jack lets you plug in a discreet earpiece for loud or private environments.
- Rugged, IP67-rated construction: waterproof and dust-tight for NZ's unpredictable conditions.
Compatibility is everything, every radio brand has its own connectors and wiring, and plugging in the wrong RSM can lead to terrible audio, failed transmissions, or a damaged radio.
PTT, VOX, and Full-Duplex Compared
How you send your voice affects the flow of conversation and even your safety in a tight spot.
| Mode | Control | Best Use Case |
|---|---|---|
| Push-to-Talk (PTT) | User has complete control over transmission | Coordinated team communication, emergency services |
| Voice-Operated Exchange (VOX) | Automatic transmission triggered by voice | Hands-free operations, machinery operators |
| Full-Duplex | No transmission control needed, both speak at once | Interactive dialogue, dispatch centres |
PTT gives you total control, preventing accidental transmissions from background noise, the gold standard for emergency services and traffic management where channel discipline matters. VOX is a lifesaver for anyone needing their hands free, a crane operator, a technician up a ladder, though it's best used where background noise is predictable rather than chaotic. Full-duplex mirrors a normal phone call, both people talking and listening at once, ideal for a dispatcher coordinating with a field team in real time.
Matching the Mic to the Job
The perfect microphone for a security guard working covertly is worlds away from the one needed by a crane operator on a noisy site.
- Security and surveillance: discreet clear acoustic tube earpieces and tiny clip-on microphones for covert communication.
- Public address: handheld mics built to project a strong, clear voice over distance and ambient noise without feedback.
- Aviation and industrial: high-noise cancelling headsets combining hearing protection with intelligible two-way communication next to running engines.
- Marine and boating: IP67-rated waterproof mics that cut through wind and engine noise while keeping the radio unit dry.
- Agriculture and forestry: rugged mics paired with vehicle-mounted or portable radios for workers operating alone over long distances.
Getting the Right Setup in Place
Mobile Systems Limited is 100% New Zealand owned and based in Mount Maunganui, with over 25 years matching microphone solutions to NZ businesses. We help you choose between PTT, VOX, or full-duplex, match RSMs to your exact radio model, and get everything set up properly from day one.
