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Updated: 2026-09-21 · 7 min read · Independent comparison
These are not really competitors. One is a finished listening device for a child. The other is a tiny cable that solves a very specific connectivity problem. But both show up in the same "headphone" searches, so it's worth being clear about which one actually fits what you're trying to do.
• iJoy Headphones — biggest strength: It's a complete, kid-focused listening solution with an 85dB volume limiter (adjustable up to 94dB), cushioned over-ear pads, a fully adjustable headband and an inline mic on a 3.5mm wired connection.
• iJoy Headphones — biggest trade-off: It's a wired, kid-oriented product — no wireless mode, no adult-sized fit, and the design and color scheme are clearly aimed at children.
• MillSO Headphone Splitter — biggest strength: It cleanly converts one 4-pole CTIA TRRS headset jack into separate green (headphone) and pink (mic) TRS plugs for PCs and dual-jack laptops, with gold-plated connectors and a braided cable.
• MillSO Headphone Splitter — biggest trade-off: It produces no sound on its own, it's strictly CTIA-standard, and it will not work with IOS-standard earphones, Bose or Beats headsets, or devices that already have a single combined jack.
• Who each pick is for: iJoy for a parent buying one safe, comfortable headset for a young kid; MillSO for someone with a proper gaming headset and a computer that has separate mic and audio ports.
The iJoy Premium Headphones are built around one idea: protect a child's hearing without making the experience miserable. The core feature is an 85dB volume limiter, which is the level generally treated as a safe ceiling for extended listening on kids' gear. What I like about how iJoy handled this is the flexibility — the limiter can be raised to 94dB when a child is in a noisy environment and genuinely needs more output to hear what's playing. That's a sensible compromise between safety and usability, rather than a hard cap that makes the headphones useless on a bus or in a loud classroom.
Who should buy it? A parent or guardian shopping for a young child or young teen who needs one set of headphones for school, online lessons, and entertainment, and who wants a volume ceiling built in rather than relying on software limits. The 20 Hz–20 kHz frequency range and dynamic drivers are standard, unremarkable specs — this is not an audiophile product and doesn't pretend to be. Who should skip it? Anyone who wants wireless listening, anyone buying for an adult who needs a large headband and neutral styling, and anyone who already owns headphones and just needs an adapter. In my opinion, the pink and blue color options and "kid" age rating make the intended audience pretty obvious.
MillSO Headphone Splitter: Who It's For
The MillSO Headphone Splitter is a two-pack of short Y-cables — about 8 inches each — that take a single 4-pole TRRS socket and split it into two 3-pole TRS plugs: green for the headphone port and pink for the microphone port on a PC. That's the whole job. If you've ever plugged a gaming headset with one combined plug into a desktop and gotten sound but no mic, or mic but no sound, this cable is the fix.
The important caveat is the standard. This splitter is built for CTIA-wired headsets — the common arrangement where the mic and ground share the sleeve in a specific order. MillSO states plainly that it is not compatible with IOS-standard earphones, Bose headphones or Beats headsets. That's not a defect; it's a wiring-standard limitation, and it's the single most common reason people buy the wrong splitter and leave a bad review. Before buying, check that your headset uses a 4-pole single plug in the CTIA standard, and that your computer actually has separate mic and audio jacks. If your laptop already has one combined jack, you don't need this at all.
Who should buy it? Anyone with a CTIA gaming headset and a PC, older laptop or dual-jack computer who needs the mic and audio to both work. Who should skip it? Anyone whose headset already connects fine, anyone using IOS-standard earbuds, Bose or Beats, and anyone hoping this cable adds any audio capability on its own.
Side-by-Side: Which Should You Choose?
• Best for a young child's hearing safety → iJoy Headphones. The 85dB limiter with a 94dB option is the defining feature here.
• Best for fixing a PC mic/audio jack problem → MillSO Headphone Splitter. It exists to solve exactly one problem, and it solves it for the right hardware.
• Best for all-day comfort on a kid's head → iJoy Headphones. Cushioned over-ear pads, adjustable headband, flexible build.
• Best for portability → MillSO Headphone Splitter. At roughly 8 inches and a fraction of an ounce, it disappears into a pocket.
• Best for built-in voice chat → iJoy Headphones. The inline mic and push-button media controls handle basic calls and school use without extra gear.
• Best for a headset you already own → MillSO Headphone Splitter. It's the only one of the two that works with equipment you already have.
• Best for universal device plug-and-play → iJoy Headphones. The 3.5mm jack covers phones, tablets, laptops, gaming devices and smart TVs.
• Best for buyers who want zero compatibility homework → iJoy Headphones. The splitter requires you to verify CTIA wiring and separate jacks first.
For most people who land on this comparison, I'd buy the iJoy Headphones. It's a finished product that does something on its own — safe, comfortable, kid-sized listening with a mic — and it works out of the box with almost anything that has a 3.5mm jack. The MillSO Headphone Splitter is a good, well-made little cable, and if you specifically have a CTIA gaming headset and a computer with split mic and audio ports, it's the right tool and I'd recommend it without hesitation. But it only helps in that narrow situation, and only if your headset matches the standard. If you're buying for a child, go iJoy. If you're fixing a jack mismatch, go MillSO. Whatever you decide, check the current price on Amazon before you commit.
Yes, that's squarely the target audience. The 85dB volume limiter, cushioned over-ear pads and adjustable headband are all designed around young children, and the wired 3.5mm connection means there's nothing to charge or pair.
No. MillSO states the splitter is not compatible with IOS-standard earphones, Bose headphones or Beats headsets. It's built for 4-pole CTIA-standard headsets connecting to a PC or laptop with separate mic and audio jacks.
No. The splitter is for computers with two separate ports — one for audio, one for the mic. If your device has a single combined jack, a TRRS headset plugs straight in and the splitter adds nothing.
Yes. They include a built-in microphone and push-button media controls, and the 3.5mm jack connects to most laptops, tablets and computers used for school and calls.
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