What the maker puts in writing
Both bullets, in full:
- “Converts video signals from one type to another”
- “Allows signal conversion from one form to another”
That is the entire bullet list.
Those are the same sentence rewritten, and neither identifies which signals, in which direction, or to what standard. Every product on this shelf converts video signals from one type to another — it is the definition of the category.
What the description adds
Everything you can learn about this box is in the paragraph underneath:
Converts digital signals to your analog TV… compatible with all TV brands… simply connect this box to your TV and antenna, and you’ll be able to watch live programs or record shows… Plug in a USB drive to view photos, play music or watch movies and recorded content. Parental controls let you take charge of the content your family can access; simply block certain channels by setting a password.
So: a conventional converter box with recording, USB playback and parental control. The password on the channel blocking is the most specific detail in the whole listing.
What is still unknown after reading all of it
The tuner standard. The word ATSC does not appear anywhere — not in the title, not in the bullets, not in the description. That is unusual even here, where seven boxes say “ATSC” without a version.
Why it matters: ATSC 1.0 has been the United States standard since 1998, and ATSC 3.0 (“NextGen TV”) is the successor, carrying 4K and HDR with better reception. Broadcasters are transitioning station by station, and a 1.0-only box stops receiving a channel once it moves.
A box that does 3.0 always says so, because it is the selling point — the ADTH at $159.99 puts it in the title and the first bullet. And Mediasonic at $39.99 handles it from the other side: “This Box does NOT support ATSC 3.0.”
The outputs. HDMI? Composite? Component? RF for a television with only an antenna input? Nothing is stated. For comparison, allaboutadapters publishes four simultaneous video outputs plus S/PDIF digital audio.
The storage limit and filesystem. The description says recording works and names no capacity. ZJBOX names FAT32 — which caps any single file at 4 GB, roughly forty-five minutes to an hour and a half of high definition — and that is the figure that decides whether you can record a film.
Whether a flash drive will work. Mediasonic warns that it will not: recording is a continuous write, and a flash drive’s sustained speed and write endurance are both poor for it.
Clear QAM. Six boxes here have it; this one does not say.
The box contents. ZJBOX itemizes a remote, an HDMI cable, a composite cable and a 1 year warranty. Mediasonic supplies a 5 ft HDMI cable and a large remote. Zenith supplies an RF cable and AV cables. This publishes nothing.
A front display. Mediasonic shows the channel and sub-channel plus a standby clock; allaboutadapters has a large LED panel. Without one, you turn the television on to see where the box is.
An antenna. Every box on this shelf requires one and only the Tablo supplies it. ZJBOX says so plainly: “requires an external antenna… It does not have signal reception or amplification functions.”
The weight.
And the price is the part that does not follow
$44.58.
On the same shelf, for less money:
iView 3300STB — $28.95 — ClearQAM, 4 TB, a built-in clock, and the only published regional restriction
iView 3500STB III — $32.96 — ClearQAM, channel 3/4 RF, HDMI, A/V and a learning remote
allaboutadapters DTV105 — $38.30 — four simultaneous outputs, S/PDIF audio, time shift, an EPG, a large LED display, last-channel memory, a metal case
ZJBOX — $38.99 — HDMI and composite cables, a 1 year warranty, and the FAT32 disclosure
Mediasonic HW250STB — $39.99 — the ATSC 3.0 warning, the flash-drive warning, firmware V1.7, a sub-channel front display, Dolby Digital, a channel 3/4 hard switch and a 5 ft HDMI cable
Five boxes that tell you what they are, all cheaper. There is nothing in this listing to weigh against them, because there is almost nothing in this listing.
Prices quoted in this text were read on October 4, 2026. The live price is at the top of the page.
