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If you want a simple wired connection that turns a USB-C phone into a source for a car stereo or a set of wired headphones, choose JSAUX USB C; if you need to cut the cord on a flight and send audio wirelessly to your headphones, choose Ugreen Airplane.
• JSAUX USB C — biggest strength: a Conexant Smart DAC chip inside a male-to-male USB-C-to-3.5mm cable, built for stable, low-loss wired audio up to 24-bit/96 kHz.
• JSAUX USB C — biggest trade-off: it is a cable, not a wireless device. If your phone has no USB-C port, or you want to walk around untethered, it does nothing for you.
• Ugreen Airplane — biggest strength: a 2-in-1 Bluetooth 6.0 transmitter/receiver with up to 18 hours of battery, so it can push audio to wireless headphones on a plane or make an old car stereo or speaker accept Bluetooth.
• Ugreen Airplane — biggest trade-off: it needs charging, depends on a working Bluetooth pairing, and its AirPods compatibility list is narrower than you would expect (AirPods Pro 2/3 and AirPods 4 are explicitly not supported).
• Who each is for: JSAUX USB C for the person who wants a plug-and-play wired link and never thinks about batteries. Ugreen Airplane for the traveler who wants their own wireless headphones working on a seatback screen.
This is a very specific tool: a USB-C to 3.5mm male aux cable. One end goes into your phone, tablet or laptop, the other into a car stereo, a home stereo, a speaker or a pair of wired headphones. There is no pairing, no battery, no mode switch. You plug it in and audio comes out. That simplicity is the entire point.
The part that matters most is the DAC. Phones dropped headphone jacks, but they also dropped the tiny digital-to-analog converter that used to live next to that jack. A cable like this has to do that job itself, and JSAUX uses a Conexant Smart DAC chip with low power draw and support for up to 24-bit/96 kHz audio. That is a meaningful step above the 16-bit/48 kHz ceiling many cheap adapters sit at, and it means the cable is not the weak link when you plug in a decent pair of wired headphones.
Then there is the physical side. JSAUX rates the strain relief at 15,001+ bend tests, which tells you the company expects this cable to live in a car, get yanked out of a center console, and get folded into a bag. The build is grey and round, male-to-male, and compatibility covers most USB-C devices — iPhone 15/16/17 series, iPhone Air, Galaxy S23 through S26, Pixel 8/9/10, iPad Pro/Air and MacBook among them.
Ugreen Airplane: Who It's For
Ugreen's adapter solves a completely different problem: the airplane seatback screen with a 3.5mm jack and your wireless headphones that have no jack at all. In transmitter (TX) mode, you plug it into the non-Bluetooth device — a plane entertainment system, a TV, an older stereo — and it broadcasts that audio to your Bluetooth headphones. In receiver (RX) mode, it flips the direction and turns a non-Bluetooth car stereo or old speaker into something your phone can stream to.
The headline specs are the Bluetooth 6.0 radio and the battery. Ugreen claims faster pairing and more stable transmission, with noticeably better audio/video sync for video and gaming, plus up to 18 hours in RX mode and 16 hours in TX mode. For a long-haul flight, that is comfortably a whole travel day on one charge. There is also a built-in microphone so you can take calls without stopping the music, a 10-meter transmission range so you are not glued to the seat, and a jog-dial control with voice control support.
Two honest caveats. First, AirPods compatibility is limited: it works with standard AirPods and AirPods Pro, but Ugreen states plainly that it is incompatible with AirPods Pro 2, AirPods Pro 3, AirPods 4 and AirPods 4 ANC. If those are your earbuds, this is not the adapter for you. Second, iPhone users do not get automatic reconnection — you will re-pair manually. Ugreen also notes that if pairing fails you should reset by holding the multifunction button for 10 seconds with the device powered off, which tells you pairing quirks are a real possibility worth knowing about up front.
Buy it if you fly with wireless headphones, or you want to modernize an old car stereo or speaker without replacing it. Skip it if you own the newer AirPods models listed as incompatible, or you would rather not manage another battery and pairing cycle.
Side-by-Side: Which Should You Choose?
• Best for higher-resolution wired audio → JSAUX USB C. The 24-bit/96 kHz DAC ceiling beats the 16-bit/48 kHz adapters it competes with.
• Best for flights with wireless headphones → Ugreen Airplane. TX mode is exactly the seatback-screen use case.
• Best for long sessions away from a charger → Ugreen Airplane. Up to 18 hours in RX mode, 16 in TX.
• Best for reviving an old car stereo or speaker → Ugreen Airplane. RX mode adds Bluetooth to gear that never had it.
• Best for durability under abuse → JSAUX USB C. The 15,001+ bend-test strain relief is designed for a life of being plugged and unplugged.
• Best for taking calls mid-playback → Ugreen Airplane. The built-in mic handles that; the JSAUX cable is audio-out only.
• Best if you use AirPods Pro 2/3 or AirPods 4 → JSAUX USB C. Ugreen explicitly excludes those models, so the wireless route may not work for you at all.
In my opinion, most people reading a comparison like this are trying to solve one of two problems, and the answer depends on which one is yours. If you fly regularly and want your own wireless headphones working on any seatback screen, the Ugreen Airplane is the more capable device — the 2-in-1 TX/RX design plus up to 18 hours of battery covers travel and home in one gadget. But if you just want a dependable cable that turns a USB-C phone into a clean analog source for the car or a wired headphone, I would buy the JSAUX USB C. It never needs charging, it never needs re-pairing, and the 24-bit/96 kHz DAC means you are not losing quality in the adapter. My pick for the widest range of everyday listeners is JSAUX USB C; my pick specifically for air travel is the Ugreen Airplane.
FAQ
No. It is a passive cable with an integrated Conexant Smart DAC chip. Plug the USB-C end into your phone or tablet and the 3.5mm end into the car stereo, speaker or headphones, and it works — no battery, no app, no setup.
On paper the JSAUX cable has the edge for fidelity because it is a direct wired connection supporting up to 24-bit/96 kHz with no wireless compression or codec in the path. Bluetooth transmission always involves some compression, so the wired route is the cleaner signal chain.
Yes, in receiver mode. Plug it into a non-Bluetooth car stereo's aux input and it becomes a Bluetooth receiver your phone can stream to. Just remember to switch to the correct mode before pairing, and expect manual reconnection on iPhone.
Both are budget-tier accessories with different jobs, so the deciding factor should be your use case rather than the number. Check the current price on Amazon before you commit.
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