Koramzi CB-107 ATSC Digital TV Converter Box

Koramzi CB-107 ATSC Digital TV Converter Box — image 1
73%
27%
88%
Ease of Setup
74%
Channel Reception
91%
Value for Money
61%
USB Recording
63%
Remote Control
67%
Build Quality
58%
Menu & Navigation
83%
Compatibility
72%
Signal Stability
69%
Media Playback
82%
Portability
71%
Long-Term Reliability
More

Overview

The Koramzi CB-107 ATSC Digital TV Converter Box is a straightforward, no-frills device designed to bring free over-the-air digital channels to older analog televisions. ATSC is simply the broadcast standard used across the United States for digital TV signals — if you have an antenna, you can pull in local HD channels without paying a cable or satellite bill. This converter box has been around since 2016, and Koramzi has kept it in production because the need remains real for many households. Beyond live TV, it doubles as a USB media player, letting you plug in a flash drive to watch stored video files. Expectations should stay grounded — this is a basic unit built for simplicity, not advanced features.

Features & Benefits

The CB-107 pulls in free HD broadcast channels using any standard antenna — no subscription required. The built-in ATSC tuner handles the heavy lifting, decoding the digital signal and outputting it to your TV via HDMI or composite connections. One of the more practical additions is the USB port, which serves two purposes: you can plug in a flash drive to record live programming, or use the same port to play back video, audio, and image files you already have stored. The remote handles channel scanning, basic menu navigation, and input switching without much fuss. At under nine inches wide, this ATSC tuner box sits neatly on a shelf or cabinet without demanding much real estate.

Best For

This converter box makes the most sense for anyone still running an older analog TV who wants local broadcast channels without the expense of a new set or a cable contract. It also works well as a secondary room solution — think a spare bedroom or a garage setup where a basic, reliable box is all you need. Cord-cutters in suburban or rural areas with decent antenna signal will get the most out of it; in areas with weaker signal, no converter box will fully compensate for poor reception. Anyone hoping for a simple way to occasionally record a show to a USB drive without a monthly fee will find it functional, if basic.

User Feedback

Among the 144 ratings on Amazon, the CB-107 holds a solid 4-out-of-5-star average — respectable for a straightforward device in this category. Most positive reviewers mention quick and easy setup, often noting that they had channels running within minutes of plugging everything in. Reception quality draws consistent praise, though several buyers point out that their results improved after upgrading their antenna. On the critical side, a handful of users report that the remote feels sluggish at times, and some have hit USB compatibility snags when recording with certain flash drives. Worth noting: the majority of negative reviews trace back to weak local signal in the buyer's area rather than any fault with the unit itself.

#Analog-to-Digital (DTV) Converters
#Television & Video
#Electronics

Pros

  • Pulls in free over-the-air HD local channels with no cable bill or monthly fees required.
  • Setup is genuinely plug-and-play — most users report being up and running within minutes.
  • The USB port doubles as a media player, handling video and audio files from a flash drive.
  • Compact size means it tucks away easily on any shelf or TV stand without hassle.
  • Works with most televisions through both HDMI and composite output connections.
  • Has been on the market since 2016 with continued manufacturer support and no discontinuation.
  • Ranked among the top ATSC converters on Amazon with a consistent 4-star user rating.
  • Offers a basic live-TV recording option to USB storage at no additional subscription cost.
  • Lightweight and easy to move between rooms if your setup needs change.
  • Remote control covers all essential functions for daily channel browsing and basic navigation.

Cons

  • The remote control feels sluggish to some users, with occasional lag between button press and response.
  • USB recording compatibility is inconsistent — certain flash drive brands and formats do not work reliably.
  • No internet connectivity means zero access to streaming apps or on-demand content.
  • Recording functionality is basic and lacks scheduling, series recording, or a proper program guide.
  • Channel reception depends entirely on your antenna and location — the box itself cannot boost a weak signal.
  • Menu navigation has been described by some buyers as clunky and not particularly intuitive.
  • No built-in storage; you must supply your own USB drive for any recording features.
  • Composite output quality on older CRT televisions can look noticeably soft compared to HDMI setups.

Ratings

The Koramzi CB-107 ATSC Digital TV Converter Box has been scored by our AI system after analyzing verified buyer reviews worldwide, with spam, bot-generated feedback, and incentivized submissions actively filtered out. Scores reflect a candid, balanced picture of real ownership experiences — both the areas where this ATSC tuner box consistently delivers and the friction points that genuine buyers have encountered. Strengths and limitations are weighted equally so you can make a fully informed decision.

Ease of Setup
88%
The vast majority of buyers — including those with little to no technical experience — report getting the box up and running within ten minutes of opening the package. Connecting the antenna, hooking up to the TV via HDMI or RCA, and running a channel scan is a process that requires no special knowledge, and most found the on-screen prompts clear enough to follow without instructions.
A small number of users ran into confusion during the initial channel scan, particularly when their antenna signal was weak and the scan returned zero or very few channels. In those cases, troubleshooting often required repositioning the antenna or purchasing a better one, which caught some first-time buyers off guard.
Channel Reception
74%
26%
In areas with solid over-the-air broadcast coverage — typically suburban zones within 30 to 50 miles of a major TV market — buyers consistently report clean, stable HD reception across local network affiliates. Paired with a quality directional antenna, the CB-107 performs reliably for everyday news and primetime viewing.
Reception quality is heavily dependent on factors outside the box itself, including antenna type, placement, and proximity to broadcast towers. Users in rural areas or locations with physical obstructions like hills and tall buildings frequently report pixelation, dropped channels, or incomplete scan results, and several mistakenly attributed this to the unit rather than their signal environment.
Value for Money
91%
For a household cutting the cord and relying solely on free over-the-air channels, the CB-107 represents an extremely cost-effective entry point. Buyers frequently note that the device paid for itself within the first month of eliminating a cable bill, and the inclusion of USB media playback adds practical utility beyond basic TV reception.
While the price-to-function ratio is strong for its core purpose, buyers who were expecting a more capable DVR experience or smarter menu interface sometimes felt the feature set did not fully justify even its modest cost. The lack of any included antenna means additional spending is likely required to get the most out of the device.
USB Recording
61%
39%
The ability to record live broadcasts to a USB drive without any monthly subscription is a genuine bonus that separates this converter box from purely passive tuners. For users who want to occasionally save a favorite program, plugging in a compatible flash drive and hitting record covers the basic need without complications.
USB recording is where the CB-107 draws the most criticism. Several buyers report that certain flash drive brands and file formats are not recognized, leading to failed recording attempts that are difficult to diagnose without trial and error. There is no scheduling function, no electronic program guide for recording, and playback of recorded content can occasionally stutter depending on the drive used.
Remote Control
63%
37%
The included remote handles all the core tasks — channel up and down, volume passthrough, menu navigation, and input switching — without requiring a separate universal remote for daily use. Most buyers find it adequate for straightforward channel browsing and basic setup adjustments.
Responsiveness is a recurring complaint, with a notable segment of reviewers describing a frustrating lag between pressing a button and seeing the TV react. The remote also feels plasticky and lightweight, and a few buyers report that it stopped functioning reliably within the first few months of regular use.
Build Quality
67%
33%
The CB-107 has a compact, no-frills housing that fits discreetly on a shelf or behind a TV without drawing attention. For a device in this price range, the physical construction is generally regarded as acceptable, and the unit itself does not generate noticeable heat during extended use.
The chassis feels lightweight and hollow, and there is a general sense among buyers that the materials used are on the lower end of the durability spectrum. Some users note that the unit feels less substantial than they expected, and the ventilation design means dust can accumulate inside relatively quickly in typical living environments.
Menu & Navigation
58%
42%
The on-screen menu covers all the functions a basic converter box needs — channel scan, input selection, aspect ratio adjustment, and USB access — and the layout is simple enough for non-technical users to find their way around without a steep learning curve.
The menu interface feels dated and sluggish compared to modern TV systems, with slow transitions between screens that some buyers describe as frustrating during daily use. A few users also note that the menu language and layout choices are not always intuitive, which can make adjusting settings like aspect ratio or favorite channels more tedious than it should be.
Compatibility
83%
The dual output options — HDMI and composite RCA — mean the CB-107 works with a wide range of television types, from flat-screen LED TVs to decades-old CRT sets. This broad compatibility is one of the more practical aspects of the device, removing the need for adapters in most standard home setups.
While TV compatibility is broad, USB peripheral compatibility is more hit-or-miss. Not all flash drives are recognized for recording or media playback, and there is no published compatibility list from the manufacturer. Buyers using older or less common USB drive formats have occasionally found the media player feature completely non-functional.
Signal Stability
72%
28%
Once a reliable antenna signal is established, the CB-107 generally maintains a stable picture without frequent dropouts during normal viewing. Users in suburban areas with a decent antenna report consistent performance across multiple months of daily use without the unit requiring resets or re-scans.
In marginal signal conditions — common in areas far from broadcast towers or in buildings with thick walls — the converter box can be prone to pixelation and brief freezing that disrupts viewing. Because the unit has no signal amplification of its own, it is entirely dependent on the quality of the incoming signal from the antenna.
Media Playback
69%
31%
The ability to play video, audio, and image files directly from a USB drive is a useful secondary feature that buyers in older households particularly appreciate. For someone who wants to view family photos or watch a downloaded video on their main TV without a streaming device, it provides a simple and functional solution.
Playback support is limited to more common file formats, and buyers attempting to play back less standard codecs or high-bitrate video files have reported that the media player either refuses to open the file or stutters through playback. It is not a replacement for a proper media streaming device, and treating it as one leads to disappointment.
Portability
82%
18%
At under 14 ounces, the CB-107 is easy to move from room to room, making it practical as a shared device in households with more than one older television. The compact footprint means it can be tucked away in a drawer or slipped into a bag without hassle.
Portability benefits are partially offset by the need to re-run a channel scan each time the box is connected to a new antenna or in a new location, which adds a few minutes of setup friction whenever the unit is relocated.
Long-Term Reliability
71%
29%
Many buyers have used the CB-107 for two or more years without reporting hardware failures, suggesting the unit has adequate longevity for typical light-to-moderate use. The manufacturer has kept the product available and unmodified since 2016, which implies reasonable confidence in the design.
A subset of buyers report that the unit developed issues — most commonly with the remote or USB recognition — after six to twelve months of daily use. There is limited information available about warranty support or manufacturer responsiveness when hardware problems arise, which is a legitimate concern for buyers relying on the unit as their primary TV source.

Suitable for:

The Koramzi CB-107 ATSC Digital TV Converter Box is a practical pick for anyone still holding onto a working analog television and unwilling — or unable — to replace it with a newer smart TV. It suits households that rely on a rooftop or indoor antenna for local channels and simply want a reliable bridge between their old set and today's digital broadcasts. Budget-conscious cord-cutters who are done paying for cable and just want the evening news, local sports, and network programming without a monthly bill will find this converter box covers those basics well. It also makes a sensible choice for a secondary room where you want functional TV without investing much money — a guest room, a workshop, or a basement setup where a no-fuss solution is all that's needed. Anyone who occasionally wants to save a program to a USB drive without signing up for a streaming or DVR service will appreciate having that option available, even if it is fairly rudimentary.

Not suitable for:

The Koramzi CB-107 ATSC Digital TV Converter Box is not the right tool for anyone expecting a full-featured DVR or a polished recording experience. If you live in a densely built urban area with weak over-the-air signal, or in a rural pocket where broadcast towers are few and far between, no converter box will fix your reception problem — signal quality is an antenna and geography issue, not a hardware one. Viewers who want to stream Netflix, access smart TV apps, or connect to the internet will need to look elsewhere entirely, as this ATSC tuner box has no network connectivity whatsoever. Those who prioritize a responsive, intuitive remote experience may find the included controller underwhelming. Finally, anyone who needs guaranteed compatibility with a wide range of USB drives for recording should know that some flash drives have caused issues for other buyers, so it pays to test yours early after setup.

Specifications

  • Brand: This converter box is manufactured and sold by Koramzi, a consumer electronics brand that has produced this unit since 2016.
  • Model: The model number is CB-107, also referenced in some listings as CD35BK.
  • Tuner Standard: The unit uses an ATSC tuner, which is the digital broadcast standard used for over-the-air television signals across the United States.
  • Dimensions: The device measures 8.75 x 9.2 x 4.85 inches, making it compact enough to sit on most TV stands or entertainment shelves.
  • Weight: The unit weighs 13.7 ounces, light enough to reposition or move between rooms without any effort.
  • Color: The CB-107 is available in black, with a plain rectangular housing that blends into most home entertainment setups.
  • USB Input: One USB port supports both live TV recording to an external flash drive or hard drive and direct media file playback.
  • Video Output: The box connects to a television via HDMI or composite (RCA) output, covering both modern and older TV models.
  • Media Playback: The built-in media player supports common video, audio, and image file formats when accessed through the USB port.
  • Remote Control: A remote control is included in the package and handles channel navigation, menu access, volume passthrough commands, and input selection.
  • Compatibility: This ATSC tuner box is designed for use with standard televisions, including older analog sets that lack a built-in digital tuner.
  • Connector Type: USB is the primary connector type for peripheral functionality, used for both recording and media playback purposes.
  • Package Contents: Each package includes one converter box unit, one remote control, and standard connection accessories; no antenna is included.
  • Country of Origin: The CB-107 is manufactured in China.
  • Availability: The product was first made available in September 2016 and has not been discontinued by the manufacturer as of the latest listing data.
  • Amazon Rating: The CB-107 holds a 4.0-out-of-5-star rating based on 144 customer ratings on Amazon.
  • Category Rank: The unit ranks #37 in the Analog-to-Digital (DTV) Converters category on Amazon, indicating steady demand relative to competing products.
  • Internet Access: This converter box has no Wi-Fi, Ethernet, or any form of internet connectivity, and cannot run streaming applications.

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FAQ

No, there are no subscription fees involved. Once you connect it to an antenna, you receive free over-the-air broadcast channels — local news, network TV, and public stations — at no ongoing cost. You just need the box and a compatible antenna.

Yes, it will. Older TVs that only have composite (RCA) inputs are supported through the analog output connection. That said, picture quality through composite on a CRT will look noticeably softer than what you would get from an HDMI connection on a newer flat-screen TV.

Any standard ATSC-compatible indoor or outdoor antenna will work. The CB-107 does not come with an antenna, so you will need to supply your own. If you are in a suburban or rural area, a directional outdoor antenna generally pulls in better results than a basic indoor model.

You can record live TV to a USB flash drive or external hard drive plugged into the unit. It is a basic feature — think of it as a simple way to save a program while it is airing, not a full DVR. There is no scheduling system or program guide for recording, and some USB drives may not be recognized, so it is worth testing your drive early.

That depends entirely on where you live and what antenna you use, not on the converter box itself. In a well-covered suburban area with a decent antenna, you can realistically expect anywhere from 20 to 60 or more channels. In areas with poor broadcast tower coverage, results will be much more limited.

Most buyers find it straightforward. You connect the antenna to the coaxial input, hook up the box to your TV via HDMI or RCA cables, power it on, and run a channel scan from the menu. The whole process typically takes under 10 minutes, and the remote walks you through the basics.

Technically yes — you can connect it to a smart TV — but there is little reason to do so. Smart TVs already have built-in digital tuners, so the converter box would be redundant. It is designed specifically to add digital tuner capability to older televisions that lack one.

In almost every case, this comes down to antenna placement or signal strength, not the converter box itself. Try repositioning your antenna, ideally near a window or higher on a wall facing the direction of broadcast towers in your area. A signal amplifier or an upgraded outdoor antenna can also make a significant difference.

The USB media player handles common formats including MP4, AVI, and MKV for video, along with MP3 for audio and JPEG for images. It covers the formats most people use day-to-day, though highly compressed or less common codecs may not play back correctly.

The remote is functional but fairly basic, and some users have noted that it can feel a little slow to respond at times. It covers all the essential controls you need for everyday use. If you lose or damage it, a universal remote programmed to the correct code should work as a replacement in most cases.