HX-921R0 – Single-Sided, Mesh-mounted Lightweight Headset with Throat Mic.

  • Mesh Head straps provide Users a stable yet comfortable fit.
  • The noise-rejecting throat mic can be used in extreme conditions and can work up to 118 dBC. (When headset is used with ear plugs)
  • The chin strap is elastic and adjustable with a quick snap plastic buckle for the perfect fit.
  • The neck strap is soft, elasticized and adjustable making it ideal for utmost comfort.
  • Breathable leatherette and soft-foam ear cushions are resistant to wear & tear.
  • Mesh Head straps provide Users a stable yet comfortable fit.
  • A high-quality, flame-retardant polyurethane cord provides extra durability.
  • 2 Year Limited Warranty



The HALO Pro® series solutions offer more Intrinsically Safe Radio headsets & accessories than any other accessories in the market.  HALO Pro® allows Users to connect Headsets and Radios via the UM (VOX/PTT) or SRI (PTT only) Interface. Or, just connect the headsets directly via an adapter cord to the host radio.  Hazmat, high noise, wet and dirty environments, can finally be handled with confidence using the HALO Pro® Intrinsically Safe headsets & available interfaces.  The UM Interfaces are energy efficient and provide 48-hour hassle-free operation.  With a choice of application-specific Headsets and the clearest audio in the business, the Halo Pro® series makes it easy to add versatility to your existing radios without compromising intrinsic safety. The interfaces may be attached to D-rings or belts using your choice of carabiner or belt loop supplied with each unit.

ABOUT HX-921R0: The HX-921R0 is a lightweight and intrinsically safe headset. This headset is reversible and can be worn on either ear, as per User preference. With a noise-rejecting throat mic. and a speech-enhancing receiver, every word can be heard crystal clear with no or minimum background noise. The single-sided receiver allows Users to maintain situational awareness while monitoring the communication from their team members.

HIGH-QUALITY SOUND: The considered selection of professional microphone & receiver elements in SED® headsets provide best-in-class voice clarity while being used in commercial environments. Noise-rejecting Throat Mic and the speech-enhancing receiver can greatly highlight voice-over background noise and ensure every word is crystal clear.

SUPER COMFORTABLE: The headset cushion is made of skin-friendly, soft and breathable leatherette foil with soft-foam backing, making it comfortable for all-day long wearing comfort without pain or pressure to the ears or head. Mesh Head straps enable users to have a fuss-free, comfortable fit while providing headset stability. Soft, elasticized and adjustable neck strap provides Users with positional stability while providing the utmost comfort. An adjustable elasticized chin strap provides extra stability and the quick snap buckle makes it easy to wear or remove.

GREAT DURABILITY: Lightweight and robust design, Stable mesh-mounted headsets, superior receiver and microphone quality. The connection cord jacket is flame-retardant polyurethane to withstand harsh environments.

COMPATIBILITY AND WARRANTY: The headsets come with a 2 Year Limited Warranty.

What is Intrinsically Safe?

Intrinsically Safe means that the system is incapable of causing an explosion or being a source of ignition in the presence of potentially explosive or combustible materials and gases.  In other words, the equipment and wiring are incapable of releasing sufficient electrical or thermal energy under normal or abnormal conditions to cause the ignition of a specific hazardous atmospheric mixture in its most easily ignited concentration.  OSHA and MSHA have many reports of fires caused by non-intrinsically safe systems.  Preventing fire and explosions is a top priority for all industries around the world.

Other Intrinsically Safe Headsets

Other Intrinsically Safe Products

Additional information



Intrinsically Safe


Number of Speakers (Receivers)




Watertight Connectors

IP-67 (To 0.5m/20')

Personal Volume Control


Ear Cushion Type

Leatherette foil on foam ear cushions

Connector Type

4 pos. Deutsch Connector (Adapter Cord available for different connector types)

Mic. Type

Electret Boom Mic. (Hardwired)

Mic. Frequency Response

100 Hz to 10 kHz

Mic. Senstivity @1kHz

Mic. Impedance @1kHz

1K5 @ 1kHz

Battery Life (avg.)


Battery Type



230g (8 oz)


Mesh with Polycarbonate Push Snap and Elastic Chin Strap

Noise Reduction Rating (NRR)


Speakers Frequency Response

300Hz to 4kHz

Speaker Impedance

1200 Ω

Ambient Noise Levels

80dBC (118dbC with earplugs)

Connection Cord Length

0.84m (2.75ft)

Connection Cord Type


Connection Cord Material

Flame retardant polyurethane

Connection Cord Temperature Range


Connection Cord Chemical Resistance


Designed For

Standard Colours



These Entity Approved headsets work with all Intrinsically Safe rated radios.

  • High Noise Environments
  • Manufacturing
  • Facility Maintenance
  • Construction
  • Machine Operations
  • Refineries
  • Breweries
  • Emergency Services
  • Search & Rescue (SAR)
  • Mining
  • Power Generation Plants
  • Agricultural
  • Aircraft
  • Maintenance
  • Underground jobs


Certifications / Safety Ratings

  • ISO 9001:2015 registered/ certified
  • CSA and UL approved as per standard #C22.2 No.157-92 and UL #913 Seventh Edition (CSA File No. 224590-1669565)
    • Class I, Div. 1 Groups A, B, C, & D
    • Class II, Div. 1Groups E, F, G
    • Class III Div. 1, Gaseous Mines


Parts & Accessories

  • Hygiene Kits
  • Leatherette foil on foam ear cushions
  • Chin straps
  • Quick snap plastic buckle
  • Mesh head strap
  • Neck straps (for Throat Mic)



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