How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want a splitter that keeps a wired 3.5mm headphone jack alive while it fast-charges your phone — a genuinely useful thing when you're mixing on headphones for music production — choose JSAUX USB C; if you need a compact 1-in-2 adapter that splits USB C into two USB C paths for a USB C headset plus charging, choose BTFO USB C Splitter.
• JSAUX USB C — biggest strength: one USB C port becomes a PD 60W charging port plus a real 3.5mm analog jack with a built-in DAC (24bit/96kHz playback), so you can charge and listen at the same time on almost any USB C phone or tablet.
• JSAUX USB C — biggest trade-off: it does not support all OnePlus and Pixel models, it won't do inline volume control on Apple EarPods, and it only records from 4-pole TRRS headsets.
• BTFO USB C Splitter — biggest strength: a simple, light (8 g) aluminum-and-TPE 1-in-2 USB C adapter, PD 60W charging, plug-and-play with no drivers.
• BTFO USB C Splitter — biggest trade-off: both outputs are USB C, so it only helps if your headphones already use a USB C plug — there's no 3.5mm jack here at all.
• Who each pick is for: JSAUX for anyone with wired 3.5mm headphones who wants to charge while they listen; BTFO for USB C-headset owners who just need to free up a port.
The JSAUX adapter does one job very specifically: it takes a single USB C port and turns it into two — a PD-compatible charging port rated up to 60W, and a 3.5mm jack for headphones. That combination is the whole point. If your phone has no headphone jack and you're tired of choosing between charging and listening, this is the piece that removes the choice.
The audio side is more serious than I'd expect from a dongle. There's a real DAC inside, with 24bit/96kHz or 16bit/48kHz playback support and a 16bit/48kHz ADC, and JSAUX specifically calls out stable output "without current noise." For casual listening that's a nice-to-have. For music production work — tracking a part, checking a mix, following a click — a clean, quiet feed matters, and a low-quality adapter is exactly where hiss and grounding noise show up. The 3.5mm port works with CTIA, TRRS and TRS plugs, so standard studio headphones and headsets connect without fuss.
Buy it if: you own wired 3.5mm headphones, want to charge and listen at once, and want a clean DAC feed. Skip it if: you're on an unsupported OnePlus/Pixel model, rely on Apple EarPod inline controls, or your headphones are USB C rather than 3.5mm.
BTFO USB C Splitter: Who It's For
The BTFO splitter solves a narrower problem. It's a 1-in-2 USB C adapter — one USB C plug goes into your phone or tablet, and two USB C ports come out, with PD 60W fast charging supported. It's built from aluminum alloy and TPE in white, it weighs about 8 grams, and there's no plug or driver involved: you connect it and it works.
That design tells you exactly who it's for. If your headphones terminate in a USB C connector — which is increasingly common on newer headsets and on earbuds aimed at spatial-audio listening — this adapter lets you keep them plugged in while charging. The charging side is genuinely quick at up to PD 60W, and the aluminum housing is a sensible choice for something that lives in a bag and gets yanked around.
The trade-off is equally clear. There is no 3.5mm jack, so if you own studio headphones with a quarter-inch or 3.5mm cable, this adapter simply can't serve them — it's the wrong tool. Because both outputs are USB C, whether your headset carries audio and mic through that port or only charges depends entirely on the headset itself. BTFO's own listing notes minor measurement and color variance from manual measurement and monitor differences; that's normal for a low-cost accessory but worth expecting.
Buy it if: you have a USB C-headset and want to charge while listening, and you value a small, light, metal-bodied adapter. Skip it if: your headphones are analog 3.5mm, or you need a mic/recording path from a wired headset.
• Best for analog 3.5mm headphones → JSAUX USB C. It's the only one of the two with a headphone jack at all.
• Best for USB C-headset owners → BTFO USB C Splitter. Two USB C outputs, no analog conversion needed.
• Best for music production monitoring → JSAUX USB C. The 24bit/96kHz DAC and the "no current noise" design target exactly the quiet, stable feed a producer wants while tracking or referencing a mix.
• Best for quick top-ups while listening → tie, on paper. Both list PD 60W, so both can fast-charge your device while audio plays — provided you pair them with a PD 20W-or-higher wall charger on the JSAUX side.
• Best for travel and pocket carry → BTFO USB C Splitter. At roughly 8 g in aluminum and TPE, it's about as unobtrusive as an adapter gets.
• Best for wide device support → JSAUX USB C. It covers iPhone 15 series, Galaxy S20–S24, Note 8–20, iPad Pro, MacBook and Huawei — with the noted OnePlus/Pixel exception.
• Best for inline headset controls → JSAUX USB C. It supports inline controls on standard headsets (just not Apple EarPods volume).
• Best for recording from a wired headset → JSAUX USB C. It accepts 4-pole TRRS headsets that support recording; BTFO's sheet lists no analog mic path.
For the way most people actually work — a phone or tablet, a set of wired headphones, and a session that runs longer than the battery does — I'd buy the JSAUX USB C. It's the more complete tool: real 3.5mm audio, a proper DAC, and 60W charging in one small adapter, which is exactly what you want when you're monitoring a mix for music production and can't afford to stop and recharge. In my opinion, the BTFO splitter only wins if your headphones are USB C to begin with, in which case its lighter, simpler design is the smarter fit. Check the current price on Amazon before you commit, and confirm your phone model is supported.
FAQ
how to fast charge bose headphones
how to charge headphones faster
Use a PD charger of at least 20W, a short, undamaged cable, and plug directly into a wall rather than a laptop port. With the JSAUX adapter, the charging port is PD-compatible and rated to 60W; the BTFO splitter also lists PD 60W, so the wall charger is the limiting factor in both cases.
how to charge headphones
Connect your headset's charging cable to a USB C power source, or plug your headset into a splitter like these to charge and listen at the same time. The BTFO splitter takes one USB C input and provides two USB C outputs; the JSAUX splits USB C into one PD charging port and one 3.5mm audio jack.
is fast charging bad for headphones
Neither data sheet suggests any risk — both are built around PD fast charging (up to 60W) as a core feature, and JSAUX describes the 3.5mm output as stable and noise-free during charging. Follow the manufacturer's guidance for your specific headphones and use a reputable PD charger.
As an Amazon Associate I earn from qualifying purchases.
We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon and affiliated sites.
When you buy through links on this page, we may earn a commission from qualifying purchases at no extra cost to you.
Amazon and the Amazon logo are trademarks of Amazon or its affiliates. This site is an independent third-party review and is not affiliated with, endorsed by, or sponsored by Amazon or the product brands mentioned.
See also: HTC True vs Drsaec Earbuds, CaseSack PocBuds Headphones 80hrs vs ELVRLA Samsung Galaxy Bud, AHG Accessory House Global Replacement SoundLink OE vs Aamft Bone Cond, iJoy Disney Lilo & vs VIFIGEN Pixel Earbuds