We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-24 · 6 min read · Independent comparison
If you want one adapter that lets you fast-charge a USB-C phone while wired headphones stay plugged in, choose JSAUX USB C; if you need the same trick on an older Lightning iPhone with guaranteed Apple-certified compatibility, choose Seulliya Apple MFi Certified.
• JSAUX USB C — biggest strength: splits a single USB-C port into a PD-compatible charging port (up to 60W) plus a 3.5mm jack, so you can listen and fast-charge at the same time on modern USB-C phones.
• JSAUX USB C — biggest trade-off: it does not support Apple EarPods inline volume control, and it isn't compatible with all OnePlus or Pixel models.
• Seulliya Apple MFi Certified — biggest strength: Apple MFi certification means no compatibility pop-ups on Lightning iPhones, plus play/pause/volume controls work through the adapter.
• Seulliya Apple MFi Certified — biggest trade-off: it only fits Lightning devices, so it's useless on USB-C phones, and it needs a 20W+ PD charger to hit full charging speed.
• Who each is for: JSAUX for USB-C Android/iPhone 15 owners who want charging plus audio in one slim dongle; Seulliya for Lightning iPhone owners who want certified reliability and full inline controls.
The JSAUX adapter is a 2-in-1 splitter. One end plugs into your USB-C port; the other end gives you two things at once — a PD-compatible charging port and a standard 3.5mm headphone jack. That means you can play games, take calls, watch video, or listen to music while the phone is still fast-charging. No drivers, no apps, no setup. Plug it in and go.
The charging spec is the headline: up to PD 60W. In practice, JSAUX notes that you'll get the fastest results with a PD20W-or-higher wall charger, and that QC may not be supported on some phones. The audio side uses a DAC rated at 24bit/96kHz or 16bit/48kHz, with an ADC at 16bit/48kHz, and JSAUX says the design keeps current noise out. The 3.5mm port accepts CTIA, TRRS, and TRS plugs, so most wired headsets will physically fit.
Seulliya Apple MFi Certified: Who It's For
The Seulliya adapter does the same two-jobs-at-once trick, but for Lightning iPhones. It's officially Apple MFi certified, which is the part that matters most here: Seulliya states it works with all Lightning port devices without the annoying "accessory not supported" pop-ups that plague uncertified dongles. If you've ever had a cheap adapter cut out mid-song, you know why that certification is worth caring about.
It splits your Lightning port into a charging input and a 3.5mm headphone jack, and it supports full inline controls — play, pause, and volume — through the adapter. Charging runs at full speed with a compatible 20W+ PD charger. Audio is handled by a high-fidelity DAC rated up to 24-bit/48kHz lossless output, which Seulliya describes as studio-grade clarity with stable transmission. It's plug-and-play with zero apps.
Durability is spelled out too: reinforced connectors, flexible TPE strain relief, and testing to withstand over 20,000 insertion/removal cycles plus repeated 180-degree bends. It ships as a 2-pack, in white, and weighs about 9 grams. Compatibility covers iPhone 14, 13, 12, 11, X/XS/XR, 8, 7, 6s, 6, SE, 5s, 5c, plus iPad Pro, iPad Air, and iPad mini models.
Who should buy it? Anyone on a Lightning iPhone who wants certified compatibility, working inline controls, and a spare dongle in the box — the 2-pack is handy for keeping one at home and one in a bag. Who should skip it? USB-C phone owners. It simply won't fit, and no adapter in this comparison covers both connector types.
• Best for USB-C phones → JSAUX USB C. iPhone 15, Galaxy S24, Note, iPad Pro, and Huawei owners get charging plus audio from one port.
• Best for Lightning iPhones → Seulliya Apple MFi Certified. iPhone 14 and older, plus Lightning iPads, are covered with certified compatibility.
• Best for maximum charging headroom → JSAUX USB C. It's rated up to PD 60W, versus Seulliya's requirement of a 20W+ PD charger for full speed.
• Best for guaranteed inline controls on iPhone → Seulliya. Play/pause/volume work through the adapter; JSAUX supports inline controls but not Apple EarPods volume.
• Best for USB-C Android gaming and video → JSAUX. The split design keeps the charge flowing during long sessions.
• Best for getting two adapters → Seulliya. It ships as a 2-pack; JSAUX is a single unit.
• Best for durability reassurance on paper → Seulliya. The 20,000-cycle and 180-degree bend testing is explicitly stated.
• Best if you own both phone types → buy each. They don't overlap at all, so there's no either/or if your household has both connectors.
In my opinion, the deciding factor is your phone's port, not the adapter's features — these two barely compete for the same buyer. If you're on USB-C, I'd buy the JSAUX USB C: the 60W PD rating, the 24bit/96kHz DAC, and the broad USB-C compatibility list make it the stronger pick for modern phones, gaming, and video. If you're on a Lightning iPhone, I'd buy the Seulliya Apple MFi Certified: MFi certification, working inline controls, and a 2-pack make it the safer, more convenient choice. Check the current price on Amazon before you commit.
Charging speed depends on the wall charger, not the adapter's audio chip. JSAUX recommends a PD20W-or-higher charger for its fastest results, and Seulliya requires a compatible 20W+ PD charger for full-speed charging. Match the adapter to a capable PD brick and you'll get the best result the design allows.
Is fast charging bad for headphones?
Wired headphones in this setup don't charge at all — they draw audio through the 3.5mm jack while your phone charges through the adapter's PD port. JSAUX splits one USB-C port into charging plus a 3.5mm jack; Seulliya splits one Lightning port the same way. Plug in both the charger and your headphones, and both jobs run at once.
If your Bose headphones are wired with a 3.5mm cable, they're powered by their own internal battery, not by this adapter — the adapter only carries audio to them. Use the adapter to keep your phone topped up while the headphones play. For the headphones themselves, charge them with their own cable and charger.
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See also: JSAUX USB C vs AILKIN Dual USB C: Fast Charge Headphones, ZOHAN 032 vs Ucaca Apple MFi Certified, JMDDS USB Charger Charging vs Xnarew 5FT: Fast Charge