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If you want to keep a wired 3.5mm headset alive on a modern USB-C phone while it fast-charges — especially on a long flight when you're juggling a movie and a dying battery — choose JSAUX USB C; if you need cable-free open-ear buds built for running and travel, with a quick top-up before you walk out the door, choose Boytond Open Ear Earbuds.
These two products are barely in the same category, which is exactly why the comparison is useful. One is a passive adapter that splits a single USB-C port into charging and analog audio. The other is a pair of clip-on wireless earbuds. What links them is the thing people search for constantly: fast charge. If you're putting together a travel kit and you keep typing "best earbuds for airplane" into a search bar, the honest answer is that you need to decide whether you want wired audio that charges, or wireless audio that charges fast. Let's sort that out.
• JSAUX USB C — biggest strength: one USB-C port becomes two jobs at once — up to 60W PD charging plus a 3.5mm output with a built-in DAC, so you can listen and top up simultaneously with no software to install.
• JSAUX USB C — biggest trade-off: it only works if you already own wired 3.5mm headphones, it doesn't do data transfer, and compatibility is uneven — the sheet flags that not all OnePlus and Pixel models work, and QC charging may not be supported on some phones.
• Boytond Open Ear Earbuds — biggest strength: up to 50 hours of battery life with the charging case, plus a 5-minute fast charge that yields roughly an hour of playtime, in an open-ear clip design that keeps you aware of your surroundings.
• Boytond Open Ear Earbuds — biggest trade-off: no noise cancelling at all — that's the point of open-ear, but it means noisy cabins and busy streets leak straight in, and the sound is never going to isolate you the way sealed buds do.
• Who each pick is for: JSAUX for the traveler or desk worker who already loves a wired headset and refuses to choose between listening and charging. Boytond for the runner, gym-goer, or commuter who wants nothing in their ear canal and hates charging anxiety.
This is a small white adapter with an aluminum alloy shell and two ports — one USB-C, one 3.5mm aux. Plug it into a phone, tablet, or laptop, plug your wired headphones into the aux side, and plug your charging cable into the USB-C passthrough. That's the whole product. The sheet lists support for up to 60W PD charging, and JSAUX recommends a PD wall charger for the faster speeds, with a note that Quick Charge may not work on some phones.
The audio side is where the engineering lives. There's a dedicated DAC chip converting digital audio to analog, and the spec calls out low power consumption and stable decoding with minimal loss or noise. Practically, that means your existing wired headphones sound like themselves instead of like a cheap dongle. You also keep in-line control, so volume and calls still work through the headset's own buttons. No drivers, no app, no pairing menu — plug and play.
Who should buy it? Anyone with a phone that dropped the headphone jack who still owns good wired cans or IEMs. It's genuinely useful on a plane: your wired headset handles the in-flight movie, and the same port keeps your phone charged for the layover. It's also a tidy desk solution for a laptop with a single USB-C port where you want audio and power at once.
Who should skip it? If you've fully moved to wireless earbuds, this adapter solves a problem you don't have. Also skip it if you're on a OnePlus or Pixel model the sheet doesn't vouch for, or if you need data transfer — that isn't supported here. And if you're expecting it to turn a non-PD charger into a fast charger, it won't; it passes through PD, it doesn't create it.
The Boytond S30i is an open-ear clip design in Mirror Black — a hook-shaped earpiece that rests around your ear rather than sealing your canal. Inside are 16.3mm dynamic drivers pushing hi-fi stereo with the sheet's claimed deep bass and crisp treble. Bluetooth 5.3 handles the connection, and touch controls manage playback and calls. Notably, there is no active noise cancelling, and the sheet is upfront about that.
The headline number is battery: up to 50 hours with the charging case. The second headline is the 5-minute fast charge giving roughly an hour of playtime. That's the spec that makes these genuinely practical. You're packing for a trip, you realize the buds are dead, you plug them in while you brush your teeth and finish the last of the packing, and you've got an hour of audio for the ride to the airport.
The open-ear design is the whole personality here. Because nothing blocks your canal, there's less pressure and fatigue over long sessions, and you stay aware of voices, traffic, and surroundings. That's a safety feature on sidewalks and trails, and a comfort feature on an eight-hour travel day. The flexible clip is built to stay put during running, gym work, and walking without constant re-seating.
Who should buy it? Runners, cyclists, gym regulars, and anyone who finds in-ear buds uncomfortable after an hour. Also travelers who want to hear the gate announcement while listening to a podcast. Anyone hunting for low-latency-feeling, hassle-free sports audio for a flight or a workout will find the clip-on format appealing.
Side-by-Side: Which Should You Choose?
• Best for charging while listening → JSAUX USB C. It's the only one of the two that charges your phone and plays audio through the same port at the same time.
• Best for battery life → Boytond Open Ear Earbuds. Up to 50 hours with the case versus an adapter that has no battery of its own and depends on your phone.
• Best for a quick emergency top-up → Boytond Open Ear Earbuds. A 5-minute charge for about an hour of playtime is about as convenient as it gets.
• Best for people who already own wired headphones → JSAUX USB C. It turns your existing cans into a modern USB-C setup instead of replacing them.
• Best for running and sports → Boytond Open Ear Earbuds. The flexible clip and open fit are designed for motion; an adapter has nothing to do with movement.
• Best for staying aware outdoors → Boytond Open Ear Earbuds. No seal, no noise cancelling, so traffic and voices stay audible.
• Best for video and calls on a laptop → JSAUX USB C. The DAC handles clean stereo audio and in-line control works for calls, with no pairing or charging to think about.
• Best for a shared travel bag → Boytond Open Ear Earbuds. It's self-contained with its own case; the adapter is only as useful as the wired headset you remember to pack.
If I'm buying for myself, I'd take the Boytond Open Ear Earbuds. For airplane travel and everyday movement, a self-contained pair with up to 50 hours in the case and a 5-minute fast charge for roughly an hour of playback removes the two things that annoy me most: dead buds and constant recharging. The open-ear fit is comfortable for long stretches and keeps me aware of announcements. I'd only reach for the JSAUX USB C if I already had a wired headset I loved and wanted to keep using it without giving up fast charging. Different jobs, and I'd pick the one that covers more of my day.
FAQ
how to charge headphones faster
is fast charging bad for headphones
There's nothing in either product's specifications indicating a problem. The Boytond buds are explicitly designed around a 5-minute fast charge for about an hour of playtime, and the JSAUX adapter is rated to pass through up to 60W PD. Both are built to their stated specs, so use the charger type each one calls for and treat heat buildup as the normal thing to keep an eye on with any fast-charge setup.
how to charge headphones
For the Boytond Open Ear Earbuds, place them in the included charging case, which provides up to 50 hours of total listening time. For the JSAUX USB C adapter, there's no battery — you connect a charging cable to its USB-C port and your phone charges through it, so the adapter itself never needs charging. Wired headphones connected to the 3.5mm side draw no power.
what should I check before buying either one
Confirm compatibility first. The JSAUX sheet notes it may not support Quick Charge on some phones and isn't compatible with all OnePlus and Pixel models, and it does no data transfer. For the Boytond buds, decide honestly whether you're fine with zero noise cancelling and an open fit. Then check the current price on Amazon to see which fits your budget.
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