Motorola RDU4100 Walkie Talkie Review

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Written By Martin C

Motorola RDU4100 Review

Business owners and property managers are constantly looking for ways to revamp their communicative efficiency on large on-premise sites, and we’ve created this Motorola RDU4100 review to see if its the perfect fit for your needs. Whether it be a construction job or a large office space,  it can be hard to reach a coworker immediately. Motorola is constantly making and selling great walkie talkies perfect for all types of businesses. The Motorola RDU4100 is no different, as it is a strong and durable business radio with 4 Watts of power and 10 channels for safe and secure communication, and its one of the best business walkie talkies. 

Motorola RDU4100 Best Features

What we love about this walkie talkie is that it has everything a business owner or other project manager would need. If a school needs to maintain communication and enhance student safety, this device is great for administrators and teachers to use. If you own a company and are looking to increase efficiency and responsiveness this device offers clear and loud communication in often noisy environments. If you are a foreman on large construction site, the RDU4100 will come through with powerful and far-reaching range. After this full Motorola RDU4100, we couldn’t recommend a more powerful walkie talkie for those looking to keep projects on track through better communication in challenging environments. 


The best way to describe this walkie talkie would be dynamic and tough. The first thing that stood out to our team about the Motorola RDU4100 is its durability. Sturdy and rugged, this device meets military specifications for sealing against dust, wind, drop shocks, vibration and other adverse conditions, as well as being able to be submerged in under 3ft of water. That’s the main reason many business owners have opted to pay the premium for the RDU4100. You simply know that no matter the elements or beating that the walkies talkies might take, not only will they survive but they are backed by Motorola’s generous warranty. We’re comfortable calling the Motorola RDU4100 one of the toughest business walkie talkies on the market today.


For a walkie talkie that is meant for large projects and business it needs to have viable range both horizontally and vertically, able to reach even the most remote parts of properties, farms, or construction sites. The Motorola RDU4100 has that high level of range, as it can communicate perfectly across up to 30 floors or around 350,000 square feet. This is a tremendous range and is one of the best available on the walkie talkie market today. No matter if you’re working on a large construction site or operating a large hotel or casino, the RDU4100 has the range to reach even the deepest or farthest away areas of your property with clear sound quality. Unlike most walkie talkies that boast an incredible range but then often fall flat when put to the test, the Motorola RDU4100 stays true to its range of up to 30 floors.  One of our testers took it to a local ranch and found it can also work on about 80 acres of land with clear communication, so if you have a large farm, or if you run security for a large property, the RDU4100 is a great fit as well. 

Battery Life 

The Motorola RDU4100 has a long standing battery life of up to 22 hours fueled by rechargeable batteries, meaning it is perfect for daily construction projects, and with its charger it can be left overnight and be ready to go at sunrise the next morning as this device has no “over-charge” side effects. This makes it a great choice for 24-hour security or construction projects where you might be rotating shifts and need continued communication capabilities. Additionally, the RDU4100 charges fairly quickly which is convenient. 

Different Pack Size and Options

No matter how many radios you are looking for, Motorola has got you covered. With a variety of pack-size options, from a solo radio to a large set, you can choose the perfect number of devices for your needs! You can also easily find a bundle with Motorola walkie talkie headsets and earpieces for easy hands free communication. You can choose from the different pack sizes below by clicking on the image for more information!

Motorola RDU4100 Specs

Dimensions and Weight

The Motorola RDU4100 comes in at 10.24 x 6.54 x 2.36 inches, but only weighs about a 1lb. The RDU4100 is thus bigger than most other walkie talkies, but this is what allows for the components for exceptional range and battery life.

Power and Charge

The Motorola RDU4100 comes with 1 lithium ion battery, which is required for use. However with this battery a user will get 22 hours of battery life on a single charge, and our team found that this is with constant use. If used minimally it can last up to a whole week.

What Could Be Better

For specific business purposes we love everything about this walkie talkie, as you can tell by our positive Motorola RDU4100 review so far. However, we do not recommend this walkie talkie for things such as camping or travel as its vertical range is great but its horizontal not so much. But overall we have no negative feedback about this device. We have found that is the perfect affordable walkie talkie for project managers and administrators alike. If you’re looking for a different type of Motorola walkie talkie, you can check out our detailed Motorola Walkie Talkie Buyer’s Guide!

What Comes in The Box

When you buy the the Motorola RDU4100, you will receive the RDU4100 Radio, Battery, Drop-in Charging Tray, Power Adapter, Belt Clip, and a User Manual.


Our Motorola RDU4100 reviews find it to be an easy to use, powerful walkie talkie which is perfectly suited for managing a business as well as employees.  Whether it be a school, construction site or even a factory, the amazing range and durability of this walkie talkie has everything you need for an easy and smooth operation whatever that operation may be. That is why we at walkie talkie central recommend this device as it is just what you need to address the daily challenges of worker safety, pressure to finish projects faster, avoiding costly mistakes and thin profit margins. If you fall within one of these categories, the Motorola RDU4100 is a no-brainer as your next business radio purchase.