Motorola On-Site RDU4100 10-Channel UHF Water-Resistant Two-Way Business Radio Price: $279.00 (as of 18/10/2019 22:32 PST- Details) & FREE Shipping.

Up to 4W Power (2W low power setting).
Pre-Programmed to 10 Channel / Code Combinations.
38 Analog and 83 Digital Interference Eliminator Codes.



The RDU4100 is a member of the new RDX Series introduced by Motorola. This On-Site Two-Way business radio is a 4 Watt, 10 Channel unit that is affordable and easy to use. With the RDX Series, it’s easier to keep projects on track through better coordination of foremen, subcontractors and individual tradespeople; just what you need to address the daily challenges of worker safety and liability, pressure to finish projects faster, avoiding costly mistakes and thin profit margins. The RDX Series radios provide the communication tool to help meet deadlines, avoid errors and keep costs within budget. The RDU4100 offers exceptional audio quality as it is 30% louder than previous XTN and AX models. These units allow you to maintain constant contact with and among workers to mobilize them and get tasks completed faster. The durable metal die cast chassis helps the radio hold up under demanding conditions. Discover what the RDX Series can bring to your construction business. Dynamic Talkaround Scan – Allows the radio to automatically switch between repeater and talkaround modes in order to optimize communications

The RDU4100 4 watt two-way radio operates on an innovative 89 business-exclusive UHF frequencies. 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.

Enhanced audio quality, rugged design, and versatile customer programming software.

The radio is part of the RDX Series of Motorola radios, a line of products designed to give businesses a competitive communications edge.

Expand the capabilities of individuals and teams, enabling them to get the job done right, fast, and safely.

Includes radio, battery, drop-in charging tray, power adapter, and belt clip.

View a feature diagram. Click to enlarge.

Business-Exclusive Frequencies
89 UHF frequencies make signals extra-secure and exceptionally clear.

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.

Build Bridges

The superior audio quality and durability of the RDX Series allows you to build bridges that expand the capabilities of individuals and teams, enabling them to get the job done right, fast, and safely. That means powerful productivity that’s perfect for:

Maintaining order and enhancing student safety are priorities for any school. RDX Series radios keep everyone in touch, from teachers and administrators to crossing guards and maintenance personnel. That enables a quick response to any situation, often preventing small problems from escalating into bigger ones.

Success in industry depends on two things: efficiency and responsiveness. Clear communication, often in noisy environments, is essential to avoid downtime–and to enable the fastest response to production problems or injuries. The RDX Series delivers. Its rugged construction stands up to industrial environments, and its long battery life meets the demands of overtime and multi-shift operations.

Excellent service and customer satisfaction are the keys to loyalty and repeat business. RDX Series radios keep your staff connected, from the front desk and concierge to event planners and maintenance personnel. That means a more productive staff and fast response to guest needs, special events, spills and emergencies.

Responsive service is essential to sales and customer satisfaction. RDX Series radios make responsiveness easier to provide, whether it’s an answer to a customer’s question, a price check, a clean-up or an emergency. With clear, constant communication ensured, customer satisfaction can be taken to the next level.

Property Management
With RDX Series radios, building managers, maintenance technicians, groundskeepers and security personnel can respond fast to tenant needs or emergencies, minimizing costs and enhancing tenant satisfaction.

To keep any construction project on track, you need timely coordination from management to foremen, subcontractors, and individual tradespeople. RDX Series radios make it easy, helping keep projects on schedule, avoid errors, meet deadlines and keep costs on budget.

Excellence in Design; Exceptional Durability

Rugged and reliable, the RDX Series radios undergo rigorous testing in the design process using U.S. Military 810 C, D, E and F Standards–so you can rest assured they hold up under demanding conditions. These tests are designed to simulate the very harshest environments, including:

  • Blowing Rain
    Steady rainfall and wind for 30 minutes on every surface.
  • Salt Fog
    48 hours of exposure.
  • Vibration
    Up to nine hours of exposure to vibration that simulates the rigors that a radio could undergo while being carried or transported.
  • Blowing Dust
    Six hours of blowing dust on all surfaces.
  • Shock
    18 shocks with a minimum G force of 40 G each.
  • Temperature Storage
    Multiple hours of exposure to storage temperatures as low as -67° F and as high as 160° F.

IP54/55 Standard
In addition, the RDX Series radios are tested to IP54/55 standards, highly demanding tests for water and dust resistance. The IP54/55 tests include subjecting the radio to a high-speed, high-volume shower from all directions for three minutes. In this test, the radio must endure conditions so harsh that a human being could not survive them.

With their Military and IP ratings, the RDX Series radios have proven they’re rugged enough to handle the harsh conditions they’ll be exposed to in daily use by your customers–and provide the maximum uptime that helps drive productivity while providing exceptional value.

RDU4100 Specs

4 Watt Yes
Adjustable power levels Yes
Coverage area: Up to 350,000 square feet (30 floors)
Frequency band: UHF
Power: 4W
Repeater Capable: Yes
Standard Battery Chemistry Type: Lithium Ion
Dimensions H x W x D (with standard battery) 4.5 x 2.2 x 1.8 inches
Display: No Display
Keypad: Limited
Weight (with standard battery): 10.3 Oz.
CPS (Customer Programming Software): Yes
Channel spacing: 12.5, 25
Cloning: With cable, With multi-unit charger (MUC
Number of channels: 10
Time out timer: Yes
Voice operated transmit (VOX): Yes
IP Standards: IP54, IP55
Mil spec: 810 C, 810 D, 810 E, 810 F
Water resistance: Yes
Standard warranty: 1 year

What’s in the Box

RDU4100 Radio, Battery, Drop-in Charging Tray, Power Adapter, Belt Clip, Users Guide
Up to 4W Power (2W low power setting).
Pre-Programmed to 10 Channel / Code Combinations.
38 Analog and 83 Digital Interference Eliminator Codes.
Two Programmable Buttons.
22 Hours Battery Life.
Two-way radio with up to four watts power (two-watt low power setting); pre-programmed to 10 channel/code combinations; two programmable buttons
38 analog and 83 digital interference eliminator codes; 22 hours battery life
Designed to IP-55 and MIL-SPEC specifications; channel scan with selectable scan list
Three voice-inversion scramble settings to minimize eavesdropping; three audible call tones
VOX with three sensitivity levels; tri-color LED with transmit, receive, and low battery indication; two-pin accessory plug


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