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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want one dongle that turns a single USB-C port into both a fast-charging PD input and a classic 3.5mm headphone jack, choose Eusbote Type C; if you need to plug in either a 3.5mm pair or a USB-C headset while still charging, choose caojunzhen 1. Both aim at the same job — listening and topping up the battery at the same time — but they solve it in two different ways, and that difference decides who should buy which.
• Eusbote Type C — biggest strength: a 2-in-1 split into one PD USB-C charging port plus one 3.5mm audio jack, with a built-in DAC rated for 24bit/96kHz Hi-Fi sound.
• Eusbote Type C — biggest trade-off: it does not support data transfer, and it only serves 3.5mm headphones — there's no USB-C audio jack on it.
• caojunzhen 1 — biggest strength: a 1-in-3 split into a PD charging port, a 3.5mm jack and a USB-C headphone jack, so you can use either kind of headset.
• caojunzhen 1 — biggest trade-off: it also skips data transfer, and the extra third port means a slightly busier little adapter to keep track of.
• Who Eusbote Type C is for: anyone with a wired 3.5mm headset who wants the simplest charge-and-listen dongle in a compact 18cm cable.
• Who caojunzhen 1 is for: anyone who owns a USB-C headset, or who switches between USB-C and 3.5mm headphones, and wants one adapter that covers both.
The Eusbote Type C is the cleaner, more focused answer to a very common problem: your phone dropped the headphone jack, but you still own good wired headphones. It takes the single USB-C port on your phone and splits it into a PD-compatible USB-C port for charging and a 3.5mm audio jack for listening. You plug in, and you can call, game, watch video or listen to music while the phone fast-charges at up to 60W PD 3.0. No drivers, no app, no setup — it's plug-and-play.
The audio side is where Eusbote leans in. There's a dedicated DAC chip inside, rated at 24bit/96kHz, and the company describes lossless, stable signal transmission with no current noise, plus HD voice-call support. The 3.5mm female port works with both CTIA and OMTP standard headphones, which matters if you're not sure which wiring your old earbuds use. Volume control is supported too, so you're not stuck adjusting everything on the phone screen.
Who should buy it: you have 3.5mm headphones you love, you want charging and audio from one port at the same time, and you don't want to think about it. Who should skip it: you've moved to a USB-C headset, or you need the adapter to pass data — it doesn't. Also note the manufacturer's own caveat that QC charging may not work on some newer phones, so a PD wall charger is the safer pairing.
caojunzhen 1: Who It's For
The caojunzhen 1 does the same core trick — charge and listen at once — but it's built for people who haven't decided what kind of headphones they'll be using. It splits your USB-C port into three: a PD-compatible USB-C charging port, a 3.5mm audio interface, and a USB-C headphone interface. That third port is the whole point. If your daily driver is a USB-C headset, this adapter serves it directly; if you also keep a 3.5mm pair around for flights or the office, that works too, without swapping dongles.
Charging is rated the same 60W PD. The built-in chip is described as identifying the voltage and current each device needs and holding that stable, which is the usual safety story on adapters like this — it protects the phone from a mismatched feed. As with Eusbote, the maker recommends a PD wall charger if you want the fastest top-up, and data transmission is not supported.
On audio, caojunzhen quotes a broader spec sheet: a DAC supporting 16bit/192kHz or 24bit/96kHz, plus a 16bit/48kHz ADC. The ADC matters more than it sounds — it's the path your microphone and calls take, so having it called out is a reasonable sign the adapter is meant for real two-way use, not just playback. The company says the design avoids current noise. Compatibility covers iPhone 16/15 Pro Max/15 Pro/15 Plus/15 and "most Type C devices," naming Pixel 8/7 XL, Galaxy Z Flip 3 5G, and the Galaxy S25 down through S8, Note 20 5G Ultra and the usual S20/S10/S9 range. It's red, it weighs 20 g, and it lists three ports.
Who should buy it: you own a USB-C headset, or you mix USB-C and 3.5mm headphones and want one adapter for both. Who should skip it: you only ever use 3.5mm headphones and want the most minimal possible dongle — in that case the extra port is just something else to keep track of, and the simpler Eusbote covers you.
• Best for 3.5mm headphone owners → Eusbote Type C. One job, done cleanly, with CTIA/OMTP support.
• Best for USB-C headset owners → caojunzhen 1. It's the only one of the two with a USB-C headphone jack.
• Best for people who switch headsets → caojunzhen 1. Three ports cover both connector types without swapping.
• Best for the smallest, most pocketable setup → Eusbote Type C. An 18cm braided cable at 3.5 g is about as unobtrusive as it gets.
• Best charging flexibility → a tie. Both quote up to 60W PD 3.0 charging and both ask you to pair them with a PD wall charger.
• Best for calls and voice → caojunzhen 1 on paper, since it specifies an ADC alongside its DAC; Eusbote counters with HD voice-call support and its own DAC.
• Best for durability-minded buyers → Eusbote Type C, with its aluminum alloy shell and nylon-braided cable called out explicitly.
• Best for wide device coverage → Eusbote Type C. Its compatibility list is the longer, more granular one across Samsung, Pixel and iPhone USB-C models.
In my opinion, most people shopping this exact category should buy the Eusbote Type C. It's the sharper tool: 60W PD charging, a 24bit/96kHz DAC, CTIA/OMTP support, plug-and-play, and a durable braided build in a genuinely pocketable 18cm cable. If your headphones are 3.5mm — and for a lot of us, the good ones still are — it does everything you need and nothing you don't. I'd only steer you to the caojunzhen 1 if you actually own a USB-C headset or bounce between both connector types; that third port is a real advantage, but it's the deciding factor, not a nice-to-have for everyone.
How to charge headphones faster
This adapter doesn't charge your headphones — it charges your phone while your wired headphones play through it. Both models pass up to 60W PD, and both makers recommend pairing them with a PD wall charger rather than relying on whatever brick is already in the drawer, since PD is what unlocks the faster rate.
How to charge headphones
If your headphones are wired, they don't need charging at all — you plug the 3.5mm plug into Eusbote Type C or into either audio port on the caojunzhen 1 and listen while your phone charges. If your headphones are USB-C, only the caojunzhen 1 has a USB-C headphone jack for them. Neither adapter transfers data.
Is fast charging bad for headphones
No — and it's worth separating the two things. The 60W PD charging here goes to your phone, not to your headphones. Both adapters use a built-in chip to hold voltage and current stable, which is the design feature meant to protect the connected device. The audio path is separate, so charging speed doesn't touch your sound.
How to fast charge Bose headphones
Bose headphones with their own battery charge from their own cable and charger, not through either of these adapters — remember, neither one supports data transfer and neither is a headphone charger. What these adapters do is let you fast-charge your phone at up to 60W PD while you listen through wired headphones.
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