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If you want a replacement cable that revives a pair of Bose or JBL headphones you already love, choose Mr Rex 2.5mm; if you need a complete budget headset for calls, meetings and webinars, choose NUBWO HW02. These two products share almost nothing except a 3.5mm plug — one is a spare part, the other is a whole headset. Picking wrong is easy, so let me break down what each one actually is.
• Mr Rex 2.5mm — biggest strength: it connects headphones that use a 2.5mm port (Bose QC/700 series, many JBL models) to virtually any 3.5mm source, with an in-line mic and volume control.
• Mr Rex 2.5mm — biggest trade-off: it is only a cable. If your headphones don't have a 2.5mm jack, it does nothing for you, and it explicitly does not fit Sennheiser or Audio-Technica headphones.
• NUBWO HW02 — biggest strength: a complete on-ear wired headset with a noise-cancelling boom microphone, dual USB-C and 3.5mm connectivity, and in-line volume control for calls and webinars.
• NUBWO HW02 — biggest trade-off: sound is tuned for voice work, not music, and it's a wired headset only — no wireless option.
• Choose Mr Rex 2.5mm if you're repairing or upgrading headphones you already own. Choose NUBWO HW02 if you need a ready-to-use headset for talking, not just listening.
The Mr Rex 2.5mm is a specialty part, and it knows it. One end is a 2.5mm plug that fits the smaller jack found on Bose 700, QuietComfort QC45, QC35II, QC35 and QC25, plus a long list of JBL models like the E45BT, E55BT, E65BTNC, Tune and Everest series. The other end is a standard 3.5mm jack that plugs into phones, laptops, PS4 and Xbox controllers, and most audio gear with a female aux port. In between sits an in-line microphone and volume control box, so you get hands-free calls and quick volume adjustments without touching your phone.
Build quality is where this cable stands out for the money. The connectors and the mic/volume box are wrapped in zinc alloy, which gives it a denser, more premium feel than the thin plastic housings on many cheap replacements. The jack is 24K gold-plated, and the inner conductor is oxygen-free copper — both standard choices for keeping signal transfer clean. The 3.5mm connector sits at a 135-degree angle, a small design decision that matters more than it sounds: angled jacks put less strain on the socket when the cable snags on a bag strap or chair arm, which is exactly how stock cables die. At 5 feet, it's longer than many stock cables, so you can set your phone down and still move around, and a Velcro strap keeps it tidy in a case or backpack.
Who should buy it? Anyone whose Bose or JBL headphones still sound great but whose original cable has frayed, crackled or gone missing. That's the core use case, and it's a smart one — replacing a cable is far cheaper than replacing headphones. Who should skip it? If your headphones use a standard 3.5mm jack, this cable is pointless for you. Same if you own Sennheiser or Audio-Technica headphones, which the manufacturer explicitly says are not compatible. And if your phone has no headphone jack, remember you'll need a Lightning or USB-C to 3.5mm adapter. Check your headphone's jack size before ordering — this is a 2.5mm cable, not a universal one.
The NUBWO HW02 is a different animal entirely: a complete wired on-ear headset built for voice. The headline feature is the noise-cancelling boom microphone, positioned to sit near your mouth rather than dangling from the earcup, which is the right call for call centers, home offices and anyone who spends hours on Skype, Teams-style meetings or webinars. The manufacturer states the headset has been optimized for compatibility with major communication software and even includes shortcuts for convenience — useful if you're jumping between calls all day.
Connectivity is genuinely flexible. The HW02 supports both USB-C and a 3.5mm audio jack, so it works with laptops, phones and anything with either port. That dual-connection approach is rare at this end of the market and means one headset can cover your desk setup and your phone. The in-line control handles volume, and the controls are button-based — practical and predictable for call use.
On the audio side, the specs tell a clear story: 27mm dynamic drivers, 32 ohm impedance, 98 dB sensitivity, and a 20Hz–20,000Hz frequency range. The 32-ohm impedance and high sensitivity mean it's easy to drive — no amp needed, which is exactly what you want for office gear. The lightweight design and soft ear cushions are aimed at extended wear, which matters when you're on back-to-back calls. It's an on-ear (supra-aural) design in graphite, so expect a lighter, less isolating feel than over-ear cups. NUBWO also backs it with a 2-year manufacturer warranty, which is a meaningful signal of confidence for a budget headset.
Who should buy it? Remote workers, students in online classes, call center staff, and anyone who needs a reliable mic more than audiophile sound. Who should skip it? If music quality is your priority, the 27mm drivers and voice-first tuning aren't built for that. And if you want wireless freedom, this is a wired headset — no Bluetooth here.
• Best for reviving existing headphones → Mr Rex 2.5mm. It's a repair/upgrade part for Bose and JBL owners, nothing more.
• Best for making calls and joining meetings → NUBWO HW02. The boom mic and communication-software optimization are the whole point.
• Best for device flexibility → NUBWO HW02. USB-C and 3.5mm in one headset covers laptops, phones and more.
• Best for build materials → Mr Rex 2.5mm. Zinc alloy connectors, gold-plated jacks and a 135-degree angled plug are thoughtful touches for a cable.
• Best for long wear comfort → NUBWO HW02. Lightweight on-ear design with soft cushions is built for hours of use.
• Best for music listening → Mr Rex 2.5mm, but only because it lets your existing Bose/JBL headphones do the work. The HW02's 27mm voice-tuned drivers are not for critical listening.
• Best for tidiness and portability → Mr Rex 2.5mm. The Velcro strap keeps it organized in a case or bag.
• Best for warranty coverage → NUBWO HW02, which carries a 2-year manufacturer warranty.
If I had to pick one, I'd buy the NUBWO HW02 — but only if I actually needed a headset. In my opinion, it's the more complete product: a mic, dual connectivity, in-line volume, comfortable on-ear design and a 2-year warranty make it the safer buy for most people who land on this comparison. The Mr Rex 2.5mm is excellent at one narrow job, and if you own Bose or JBL headphones with a 2.5mm jack, it's the smarter purchase — you'd be restoring headphones you already like for far less than replacing them. Ask yourself one question: am I fixing something, or buying something new? Fixing → Mr Rex. New → NUBWO.
Yes. The manufacturer lists Bose 700, QuietComfort QC45, QC35II, QC35 and QC25 as compatible. Just confirm your headphones use a 2.5mm jack, not a standard 3.5mm one.
Yes. It supports USB-C and a 3.5mm audio jack, so it connects to laptops, phones and other devices with either port. That's one of its main advantages over a single-connection headset.
Neither is a music-first product. The Mr Rex is a cable, so your Bose or JBL headphones handle the sound. The NUBWO HW02 has 27mm drivers tuned for voice, so it's fine for casual listening but not for critical music enjoyment.
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