Motorola RDU4100 4 Watt 10 Channel UHF Two Way Radio

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  • The RDU 4100 meets military standards for high resistance to dust, moisture, shock, and vibration. Includes Li-Ion 2400 mAh battery with up to 18.5 hours of operation, 12 hour desktop charger, and heavy-duty spring action belt clip.
  • Motorola RDU4100 Two-Way UHF Radio really out performs all others when it comes to toughness. With a metal die-cast chassis encased in polycarbonate. Perfect for Construction Sites.
  • With the RDU4100 Job Site Managers are instantly accessible to workers all the time, anywhere around the workplace. New hires hear the exchange of information, accelerating training and effectiveness. Instant communication improves productivity, customer service, safety and security.
  • RDU4100 is an On-Site Two-Way business radio that is 4 Watts, 10 Channels and affordable. It's easy to use and keeps projects on track through better coordination of foremen, subcontractors and individual tradespeople.
  • The Motorola RDU4100 two way radio offers 10 channels and 4 watts of power, providing coverage for up to 350,000 square feet or 30 floors. Great for Big Jobs, Construction Sites, Farms, Apartments and more.
  • Keep your team in close contact on tough terrain with Motorola RDU4100 Two-Way UHF Radios.
MSRP: $359.00
— You save $50.00
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  • This HKLN4604 Motorola stylish swivel earpiece with in-line microphone and push-to-talk has been designed for all day comfort while providing discreet communications. Boasting a unique design that makes a savvy statement in retail, education, and hospitality settings, it’s perfect for busy professionals on the move.
  • The HKLN4601 Surveillance Earpiece Kit is our single-wire surveillance earpiece is designed to provide simple, efficient and discreet hands-free communications. This Dual-pin surveillance earpiece with inline microphone and push-to-talk is just what you need. Perfect for the CLS1410 or the RMU2040 but works on all 2-Pin Motorola radios.
  • The Motorola HKLN4606 is a remote speaker microphone for Motorola CLS, DLR, DTR, RDX and RM Series business two way radios. Perfect for security and construction jobs and the RDU4100 radio.


 The RDU4100 is the work horse of the Motorola line. This 4 watt model reaches where most other lower powered radios can't. Perfect for construction sites, large warehouses, shopping malls and schools. The RDU4100 brings workplace noise to its knees by helping to ensure exceptional audio quality in the loudest environments. Designed for noisy areas, our radios are 30% louder than previous Motorola models as a result of new design enhancements. This business-essential radio provides the perfect partnership of excellent audio and exceptional durability.

The Motorola RDU4100 4 watt two-way radio operates on an innovative 89 business-exclusive UHF frequencies and is FCC Narrowband ready. The default factory programming on this RDX radio is set to operate in 12.5kHz mode. Enhanced audio quality, a rugged design and versatile customer programming software, make this radio an exceptional choice for all of your on-site business needs. 

Business-exclusive frequencies - 89 UHF frequencies make signals extra-secure and exceptionally clear. 219 codes, including customized PL and DPL codes to help ensure a clear signal

Exceptional voice quality - Delivers increased clarity through wind-noise reduction.

Rugged and water-resistant - Meets military specifications for sealing against dust, wind, shock, vibration and other adverse conditions.

Customer programming software - Allows users to perform programming functions and access new features.

Bright sensors - Tricolor LED indicator shows feedback of calling or monitoring features.

Enhanced battery performance - Lithium-ion battery lasts longer, with no memory “over-charge” side effects.

Simplified cloning - Quickly copies settings from radio to radio when used with accessory.

Voice activation - Enables hands-free operation when used with accessory.

Disable Channel - Allows users to disable and skip undesirable channels via the customer programming software (CPS)

Channel Annunciation - Voice support for channel announcement

Antimicrobial Coating - Helps prevent the growth of mold and germs on the surface of the radio.

Repeater Capability - Compatible with duplex repeaters so you can significantly extend your radio coverage area

Dynamic Talkaround Scan - Allows the radio to automatically switch between repeater and talkaround modes in order to optimize communications.


  • 10 Channels
  • 350,000 Sq. Ft. / 30 Floor Coverage
  • 89 UHF Business Frequencies
  • 219 Interference Eliminator Codes
  • 4.0 Watt Output Power
  • Rechargeable Lithium Battery Pack up to 18.5 Hours of use
  • Includes Drop-In Battery Charger
  • Hands-Free (VOX) Mode (with compatible accessories)
  • Voice Scrambling
  • Easy Cloning (cloning cable or multi-charger required)
  • Manager Lockout
  • Voice Compression Technology
  • Call Alert Tones
  • Channel Scan
  • Scan Channel Delete
  • Talk Confirmation Tone
  • Low Battery Alert
  • Battery Saver
  • PC Configurable (programming cable not included)
  • Timeout Timer
  • Monitor Channel
  • Keystroke Tone Signal
  • Removable Antenna
  • Two Pin Audio Accessory Connector
  • Meets Military 810 C, D, E, F, G and IP54/55 Specifications
  • Two Year Manufacturer Warranty
  • FCC License required

What come's in the box:

  • Motorola RDU4100 Radio
  • Re-enforced Belt Clip
  • 18.5 hour Li-Ion Battery
  • Single Unit Drop In Charger
  • AC Adapter
  • Owner's Manual

Factory Programmed Default Info:

Channel / Frequencies / CTCSS Code

Channel 1 / 464.5000 / 67.0 Hz
Channel 2 / 464.5000 / 77.0 Hz
Channel 3 / 464.5000 / 88.5 Hz
Channel 4 / 464.5000 / 179.9 Hz
Channel 5 / 464.5000 / None
Channel 6 / 464.5500 / 67.0 Hz
Channel 7 / 464.5500 / 82.5 Hz
Channel 8 / 464.5500 / 94.8 Hz
Channel 9 / 464.5500 / 179.9 Hz
Channel 10 / 464.5500 / None

Motorola RDU4100 Owners Manual

Motorola RDU4100 Specification Sheet

Motorola RDU4100 Brochure

Motorola RDU4100 Construction Site Applications

Motorola RDU4100 Education / School Applications

Motorola RDU4100 Grocery Store Applications

Motorola RDU4100 Manufacturing / Warehouse Applications

Motorola RDU4100 Property Management Applications

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Warranty Information

Two Year Manufacturer Warranty from Motorola - This is the warranty provided by the manufacturer. See manual for specific details.
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3 Reviews

  • 5
    works great

    Posted by roger on Jan 4th 2019

    we are roofers and this radio comes in clear

  • 5
    Easy to use.

    Posted by Marco on Sep 26th 2018

    Clear, good volume, easy to use, recharges quickly. Liked the radio. We have over 10 of them.

  • 4
    quality is great

    Posted by James P. on Nov 14th 2017

    Worth the money. We use these on the floor of our plant and they withstand the daily abuse they get. The signal is strong and the quality is great. Wish the battery lasted longer, we have long shifts.

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