We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-22 · 8 min read · Independent comparison
If you want one cable that reaches across a desk, survives daily plugging and unplugging, and fits a long list of Bose, JBL and AKG headphones, choose Mr Rex 2.5mm; if you need a full set of kids' headphones with a volume cap, Bluetooth, a mic and a wired fallback, choose QearFun Kids Unicorn. These two products barely compete — they solve different problems. One is a replacement aux cord. The other is a complete pair of over-ear headphones built for children.
• Mr Rex 2.5mm — biggest strength: a 10 ft/3 m oxygen-free copper aux cable with a 2.5mm male to 3.5mm male connector, a 135-degree angled plug, gold-plated contacts and a reusable velcro tie, built to replace the cord on specific Bose, JBL and AKG headphones.
• Mr Rex 2.5mm — biggest trade-off: it is a cable only, and it explicitly does not fit Sennheiser or Audio-Technica headphones, so compatibility has to be checked before buying.
• QearFun Kids Unicorn — biggest strength: a complete over-ear kids' headphone with Bluetooth 5.3, 60-hour battery life, a parent-controlled 74/85/94dB volume limit, a built-in HD mic and a 3.5mm wired mode.
• QearFun Kids Unicorn — biggest trade-off: it is a children's product with a passive-only noise cancellation design and a fixed 32-ohm, 40mm driver — not a reference or audiophile headphone, and not a replacement cable.
• Who each pick is for: Mr Rex 2.5mm is for adults repairing or extending a specific pair of Bose, JBL or AKG headphones; QearFun Kids Unicorn is for parents buying a first proper headphone for a child.
The Mr Rex 2.5mm is not a headphone. It is the cord you buy when the original cable on a pair of Bose QC45, QC35, QC35II, QC25 or Bose 700 headphones has failed, gone missing, or is too short for the way you actually sit. That is the whole point of this product, and it does that job with a spec sheet that reads like someone thought about real desk life.
The headline number is the length: 10 feet, or 3 meters. If you plug into a desktop amp, a laptop or a PC, that extra reach means you can stand up, lean back, or walk a few steps without unplugging. Most stock headphone cables are nowhere near that generous, and for anyone who works at a desk with wired headphones, that single difference changes the daily experience more than any other spec here.
Build quality is where the details matter. The conductor is oxygen-free copper, the connector is 24K gold-plated, and the plug is set at a 135-degree angle — a shape that puts less stress on the joint where cables usually fail. The connector housing is metal with a dual-layer cover, and the outer jacket is thermoplastic elastomer, which is the flexible, rubbery material you want on something that gets coiled and uncoiled constantly. Mr Rex also throws in a reusable velcro tie, which sounds minor until you have a 10-foot cable loose in a bag.
Who should skip it: owners of Sennheiser or Audio-Technica headphones, which the manufacturer explicitly excludes. Also skip it if your device has no 3.5mm jack at all — you would need a Lightning or Type-C to 3.5mm adapter first. And skip it if you wanted headphones, not a cable.
QearFun Kids Unicorn: Who It's For
The QearFun Kids Unicorn is a completely different animal: a full pair of over-ear Bluetooth headphones designed for children, sold in Dino, Cat and Unicorn styling with an electroplated gradient finish. The Unicorn version is pink with a sparkly horn, and the styling is clearly meant to be an accessory a kid actually wants to wear, not just a device a parent imposes.
The feature that matters most to parents is the volume limit. There is a three-level cap controlled by a hidden button: 74dB for toddlers, 85dB for everyday listening, and 94dB for noisy environments like a plane cabin. The hidden placement is deliberate — it stops a child from quietly maxing out the volume behind your back. That is the single most important design decision on this product, and it is well thought through.
Around that core sit solid everyday specs. Bluetooth 5.3 gives a stable connection to iPads, tablets and Chromebooks with a 10-meter range. The 40mm dynamic drivers cover a 20Hz–20kHz range at 32 ohms, which is normal, serviceable territory for kids' content. Battery life is rated at 60 hours with a 1.5-hour charge time — that is genuinely long, and it means charging becomes a weekly chore instead of a nightly one. There is a built-in HD microphone for online classes and family calls, plus a 3.5mm jack for wired mode when the battery is flat or when a school or airline requires a cable.
Comfort and durability get real attention too. The ear cushions are soft PU, the headband is steel-reinforced and adjustable, and the fit is described for ages 3 to 20. The whole thing folds, which helps in a backpack. Noise control is passive only — the seal of the cushions, not active cancellation — so do not expect the quiet of a noise-cancelling adult headphone.
Who should buy it: parents or gift-buyers shopping for a child who needs headphones for school, tablets, travel or calls, and who want a volume cap and long battery life in one package.
Who should skip it: anyone looking for a replacement cable, anyone wanting active noise cancellation, and anyone shopping for an adult critical-listening headphone.
• Best for replacing a broken Bose or JBL cable → Mr Rex 2.5mm. That is its entire purpose.
• Best for a child's first real headphone → QearFun Kids Unicorn. Volume limiting, mic, Bluetooth and wired mode all in one.
• Best for reach and desk use → Mr Rex 2.5mm. The 10 ft/3 m length is the standout number in this comparison.
• Best for battery life → QearFun Kids Unicorn. 60 hours rated, charged in about 1.5 hours.
• Best for hearing protection → QearFun Kids Unicorn. The 74/85/94dB parent-controlled limit has no equivalent on a passive cable.
• Best for durability under daily plugging → Mr Rex 2.5mm. Gold-plated contacts, a 135-degree angled plug and TPE jacket are chosen for repeated use.
• Best for school and online classes → QearFun Kids Unicorn. The built-in HD mic and wired mode cover both video calls and cable-only classroom setups.
• Best for travel with a kid → QearFun Kids Unicorn. Foldable build, 10-meter Bluetooth range and a 94dB setting for plane noise.
• One honest caveat on both: check compatibility. Mr Rex excludes Sennheiser and Audio-Technica, and QearFun is sized for ages 3–20, not adults.
In my opinion, these two do not really compete, so the decision is about what you are actually missing. If you own compatible Bose, JBL or AKG headphones and the cable is the problem, I would buy the Mr Rex 2.5mm — the 10-foot length, angled gold-plated plug and TPE jacket are exactly the right priorities for a cable that lives on a desk. If you are buying for a child, I would buy the QearFun Kids Unicorn instead, because the parent-controlled volume limit, 60-hour battery and built-in mic solve problems a bare cable never could. Buy the Mr Rex to repair a headphone you already love. Buy the QearFun to give a kid a headphone that is safe, comfortable and actually fun to wear.
FAQ
how to make aux cable with headphones
how to use wired headphones without headphone jack
You need an adapter, and both products assume one. Mr Rex notes directly that phones without a 3.5mm port require a Lightning or Type-C to 3.5mm female adapter. The QearFun Kids Unicorn sidesteps the issue for daily use because it connects over Bluetooth 5.3, and you only need the 3.5mm cable when you want wired mode or the battery is empty.
how do i connect my wired headphones to my phone
Plug the 3.5mm end into the phone's headphone port. If your phone has no 3.5mm port, add a Lightning or Type-C to 3.5mm adapter first. On the Mr Rex cable the 2.5mm end goes to the headphone and the 3.5mm end to the phone; on the QearFun Kids Unicorn, just switch it on and pair over Bluetooth if you would rather skip cables entirely.
No. It is a complete over-ear kids' headphone with Bluetooth, a mic and its own 3.5mm cable, not a spare cord. If your Bose, JBL or AKG headphone only needs a new cable, the Mr Rex 2.5mm is the right purchase — check the current price on Amazon using the button on this page before you decide.
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See also: QearFun Kids Unicorn Headphones vs HORI Gaming Headset Brown, QearFun Kids vs kinverve Neckband: Headphones With, aux wired headphones