When you have one HDMI source-a cable box, streaming stick, laptop, or game console-but several screens that all need to show the same thing, you face a classic connection puzzle. Do you swap cables every time you switch rooms? Do you daisy-chain through multiple outputs that may not exist on your device? Or do you add a splitter that sends one signal to multiple displays at once? For HDTVs, monitors, and projectors in the same room, a 1-to-4 splitter can solve that problem without replacing your gear, and the onn. 4-Port High Speed 4K HDMI Splitter is built for exactly that job.
Quick verdict
The onn. 4-Port High Speed 4K HDMI Splitter takes one HDMI input and distributes it to four outputs, letting you show the same 4K-capable signal on four screens at a time. At USD 19.50, it is a straightforward way to duplicate video and audio to multiple displays if you already have the HDMI cables and don't need switching between different sources.
Who it suits
This splitter makes the most sense for setups where every display should mirror the same content: a classroom projector and a few monitors showing one lecture, a retail counter feeding several HDTVs the same promo reel, a sports bar corner with multiple projectors, or a home theater where you want the same movie on a big screen and a secondary monitor. Because the description says it is compatible with universal brands and works with projectors, cables, and devices, it is meant to fit into an existing HDMI setup rather than requiring a specific ecosystem.
What stands out from the listed details
The biggest feature is the 1 : 4 connection split-one source, four outputs. The product title and description both emphasize high-speed 4K, so if you are sending 4K content to multiple displays, this splitter is designed to handle that signal type. It also lists audio/video outputs as HDMI, meaning the same HDMI cable carries both sound and picture to connected displays. The circular design is mentioned as a visual detail, but the practical takeaway is the straightforward four-way duplication. The price of USD 19.50 makes it an accessible option for a single-room multi-display setup.
onn. 4-Port High Speed 4K HDMI Splitter For HDTVs Monitors and Projectors - NEW
This is the product to pick when your main need is simultaneous duplication. The splitter's entire purpose is to take one HDMI source and feed four outputs, which means you can place a projector in one corner, a monitor at a desk, and an HDTV on the wall without moving cables around. The listed 4K high-speed capability means it is aimed at modern sources, and the universal compatibility wording suggests it should work with the devices you already own.
A limitation to keep in mind: it is a splitter, not a switch. It duplicates a single source to four displays; it does not let you choose between several sources feeding one screen. Also, the listed connection split is specifically 1 to 4, so if you need more than four outputs or fewer than four, this exact model is fixed at that count. You are also responsible for supplying the HDMI cables for each display, and the product details do not include cable lengths, so plan for your own wiring.
Meaningful trade-offs
For a dedicated single-source, multi-display room, this splitter is useful because it does one job cleanly. But the trade-off is inflexibility: you cannot turn off individual outputs independently, swap between input devices, or adjust resolution per screen based on the provided information. If your goal is to mirror one signal to four screens, that's fine. If you need to send different content to different displays, you would need a different type of device. The price is listed at USD 19.50, which is a reasonable focal point, but factor in the cost of four HDMI cables if you don't already own them.
Bottom line
For a simple, no-frills way to get one 4K HDMI signal onto four screens at once, the onn. 4-Port High Speed 4K HDMI Splitter matches the job description. It is best for projector setups, multi-monitor workstations, or retail and classroom displays that all need to show the same source. The fixed 1-to-4 layout and lack of switching are the key limitations, but if mirroring is all you need, this splitter gives you that capability for USD 19.50.
