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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-25 · 7 min read · Independent comparison
• Callez 3.5mm — biggest strength: it is a true replacement cord for headphones that use a 2.5mm jack on the headset side (Bose QC25/QC35/QC45/700, several JBL Tune and AKG models), and it adds an in-line mic and volume control the original cable may not have.
• Callez 3.5mm — biggest trade-off: it is narrow by design. It does not fit Beats or Sony headphones, and it only works with the specific 2.5mm-jack models listed — the wrong headphone means no signal at all.
• Seulliya USB C — biggest strength: it turns a USB-C port into a standard 3.5mm aux output using an advanced DAC chip rated up to 24bit/96kHz, so wired headphones, speakers and car stereos work on phones that dropped the headphone jack.
• Seulliya USB C — biggest trade-off: it is a dongle, not a headphone repair part. It does nothing for a Bose headset with a worn-out cable, and its real maximum output depends on the headset you attach.
• Who each pick is for: Callez 3.5mm for people repairing or upgrading a specific 2.5mm-jack headset; Seulliya USB C for people whose phone, tablet or laptop has no headphone jack at all.
The Callez 3.5mm cable is a niche product, and it is unapologetic about it. One end is a 2.5mm plug that seats into the headphone itself; the other is a standard 3.5mm plug that goes into your phone, laptop, tablet, controller or any device with a single 3.5mm jack. That 2.5mm-to-3.5mm layout is exactly what Bose QuietComfort 25, 35, 35II, 45 and 700 owners need when the factory cable frays, disappears, or starts cutting out in one ear. The same applies to a long list of JBL Tune and Club models and a handful of AKG sets — all of which use a 2.5mm port rather than the more common 3.5mm one.
Skip it if you own Beats or Sony headphones, or anything not on the compatibility list — the 2.5mm plug simply will not seat or will not pass audio correctly. Also note the adapter caveats: newer iPhones need an original Lightning-to-3.5mm adapter, and Xbox controllers need the original headset adapter. If your headphones have a normal 3.5mm socket on the earcup, this is not your cable.
Seulliya USB C: Who It's For
The Seulliya USB C cable attacks the opposite problem. Modern phones, tablets and laptops increasingly ship with a USB-C port and nothing else. If you still own good wired headphones, or your car only takes an aux cord, that port is useless without a converter — and that is precisely what this is. USB-C goes into the device; 3.5mm comes out the other end into headphones, a car stereo, a home stereo or a speaker. It is a two-pack, which matters more than it sounds: one can live permanently in the car and one in a bag, so the cable is where you need it instead of on your desk.
Inside, Seulliya uses an advanced DAC chip and rates the cable up to 24bit/96kHz for high-fidelity stereo output. The company also states it has completed MFi certification requirements and uses an original terminal and smart chip, with the promise that no warning message pops up when you connect it. Plug and play is the whole point here — no software, no drivers, no setup ritual. Physically it is short, around 39.6 inches, which is ideal for a phone in a pocket or a phone mounted on a dashboard, but noticeably short if you like to roam around a room while listening.
The compatibility list is broad: iPhone 15/16 family, Samsung Galaxy S23 down through S8, Note 20 through 8, iPad Pro, iPad mini 6, MacBook, Google Pixel, and several Huawei models. What it cannot do is fix a headset. If your Bose cable is the broken part, this dongle is irrelevant to you. And because the actual maximum audio output depends on the headset device, do not expect the DAC to magically make hard-to-drive headphones loud — it converts the signal cleanly, it does not add power.
Side-by-Side: Which Should You Choose?
• Your phone has no headphone jack but your headphones are fine → Seulliya USB C. It restores the 3.5mm socket you lost.
• You want an in-line mic and volume buttons on your Bose or JBL headset → Callez 3.5mm. The Seulliya cable has no controls at all.
• You want to play music through a car stereo from a USB-C phone → Seulliya USB C. That is its core multi-function use case.
• You own Beats or Sony headphones → neither, as configured. Callez explicitly does not fit them, and Seulliya only helps if the Sony/Beats set ends in a 3.5mm plug you can plug into the dongle.
• Longest usable cable length → Callez 3.5mm at 5.09 ft versus roughly 39.6 inches for Seulliya.
• Highest stated audio resolution figure → Seulliya USB C, rated up to 24bit/96kHz via its DAC chip.
• Best for two locations at once → Seulliya USB C, since it arrives as a two-pack.
• Best for desk, gaming and TV listening with a wired headset → Callez 3.5mm, given its length and controller-friendly 3.5mm end.
If I had to pick one for myself, I would buy the Callez 3.5mm — but only because my use case is reviving a pair of 2.5mm-jack noise-cancelling headphones, and the in-line mic and volume control make the cable genuinely better than a plain replacement. That is a narrow reason, and it is the honest one. If your problem is a phone with no headphone jack, the Callez cable is completely wrong for you, and the Seulliya USB C is the sensible buy: certified, plug and play, and built around a DAC that handles the conversion properly. Match the cable to the port you actually have, and either one is a clean, unglamorous fix.
FAQ
how to use wired headphones without headphone jack
how do i connect my wired headphones to my phone
First check which plug your headphones use. If they end in a standard 3.5mm plug and your phone has no jack, use the Seulliya USB C cable. If they are Bose or JBL headphones with a 2.5mm socket on the earcup, use the Callez 3.5mm cable, which plugs into the headset and then into your device.
how to make aux cable with headphones
You generally do not make one — you buy the right cable for the two ports involved. The Callez 3.5mm converts a 2.5mm headphone socket to a standard 3.5mm aux plug with mic and volume control, while the Seulliya USB C converts a USB-C port to a 3.5mm aux output. Pick based on which end you are missing.
will these cables work with Beats or Sony headphones
The Callez 3.5mm cable is explicitly not for Beats or Sony headphones and only fits the listed 2.5mm-jack models. The Seulliya USB C cable will work with any headphones that end in a standard 3.5mm plug, provided your source device has a USB-C port.
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