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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want to keep a 3.5mm wired headset alive on a modern phone while still fast-charging through the same port, choose SIXSIM USB C; if you need a USB-C audio and charging splitter built by a dedicated audio brand and you're fine plugging in USB-C headphones instead of a traditional 3.5mm jack, choose MEE audio 2-in-1.
• SIXSIM USB C — biggest strength: It's a true 2-in-1 splitter that gives you a 3.5mm audio jack plus up to 60W PD charging, so your old wired earphones and your charger can share one port at the same time.
• SIXSIM USB C — biggest trade-off: It does not support data transfer, and it only handles analog 3.5mm headsets — no USB-C headphones allowed.
• MEE audio 2-in-1 — biggest strength: It comes from MEE audio, a Los Angeles audio company founded in 2005 that specializes in in-ear monitors and portable audio, and it carries a 1-year manufacturer warranty.
• MEE audio 2-in-1 — biggest trade-off: Its two female ports are both USB-C, so it splits your phone's port into USB-C audio + USB-C charging — there's no 3.5mm jack for a classic wired headset.
• Best for old-school 3.5mm earphones + charging → SIXSIM USB C.
• Best for USB-C headphone users who want a brand with an audio pedigree → MEE audio 2-in-1.
The SIXSIM USB C is a small dongle with a very specific job: it takes the single USB-C port on your phone and turns it into two useful things at once — a 3.5mm headphone jack and a PD-compatible USB-C charging port. That means you can watch a video, take a call, or play a game on wired earphones while your phone is topping up. For anyone who still owns a favorite pair of 3.5mm IEMs or a wired gaming headset, that's the whole appeal. You don't have to choose between listening and charging anymore.
The charging side is genuinely capable. SIXSIM rates it for up to 60W PD charging with a built-in chip that reads the voltage and current your device wants, which is the kind of headroom that keeps voltage steady instead of letting it sag. There's a practical note in the product details worth repeating: for the fastest results, pair it with a PD wall charger and a PD cable. On the audio side, the adapter handles DAC up to 16bit/192kHz or 24bit/96kHz, plus ADC at 16bit/48kHz, and it works with both CTIA and OMTP headset wiring standards — which matters, because a mismatched standard is exactly why some cheap adapters give you muffled sound or a dead microphone.
Who should skip it? If you've fully moved to USB-C headphones, this isn't your adapter — it has no USB-C audio port. And if you ever need to move files through the same dongle, remember it's audio and power only, no data.
MEE audio 2-in-1: Who It's For
The MEE audio 2-in-1 is a different animal. It's a USB-C male plug that splits into two USB-C female ports, letting you run USB-C audio and USB-C charging at the same time from a single port on your phone or tablet. If you own modern USB-C earphones or a USB-C DAC dongle and you're tired of unplugging them every time the battery gets low, this is the exact problem it solves. It's aimed at iPhone 15/16/17, Samsung Galaxy, iPad and Pixel owners — essentially the same USB-C-only crowd that lost its headphone jack.
Where MEE audio stands apart is the brand behind it. MEE audio has been making portable audio gear since 2005 out of Los Angeles, with a catalog built around in-ear monitors, wireless audio solutions and hearing protection. That background doesn't magically change what a splitter does, but it does tell you the company's whole identity is sound, not generic phone accessories. The unit also carries a 1-year manufacturer warranty, and it's a single-count item (one adapter in the box, not a multipack).
The trade-offs are real, though. There's no 3.5mm jack here, so if your headphones end in a standard analog plug, this adapter can't help you — you'd need a separate USB-C-to-3.5mm dongle stacked on top, which defeats the point. There's also no plug or battery involved; it draws everything from your device. And because it's one unit rather than a two-pack, there's no spare if it goes missing in a bag.
• Best for 3.5mm wired earphones → SIXSIM USB C. It's the only one of the two with a real analog headphone jack.
• Best for USB-C headphones or a USB-C DAC → MEE audio 2-in-1. Both female ports are USB-C, matching modern digital headsets.
• Best for fast charging while listening → SIXSIM USB C. It's explicitly rated for up to 60W PD charging with voltage/current regulation.
• Best for audio-brand pedigree and warranty coverage → MEE audio 2-in-1. Backed by a company that has specialized in portable audio since 2005, with a 1-year manufacturer warranty.
• Best for headset microphone compatibility → SIXSIM USB C. It supports both CTIA and OMTP wiring, which is what keeps mic and remote buttons working across different headsets.
• Best for buyers who want a spare → SIXSIM USB C. It ships as a two-pack; the MEE audio is a single unit.
• Best for iPhone 15/16/17, Galaxy, iPad and Pixel owners → either, since both list those platforms — the deciding factor is whether your headphones are 3.5mm or USB-C.
• Best for file transfer → neither. SIXSIM states plainly that its adapter does not support data transfer, and the MEE audio splitter is described purely as an audio and charging adapter.
In my opinion, the SIXSIM USB C is the easier recommendation for most people, simply because 3.5mm headphones are still everywhere and the 60W PD passthrough plus CTIA/OMTP support covers the two things that actually annoy people about cheap adapters — slow charging and a microphone that doesn't work. I'd pick the MEE audio 2-in-1 only if I'd already committed to USB-C headphones or a USB-C DAC and wanted an audio-focused brand with a warranty behind the dongle. Decide based on the plug on the end of your headphones, and the choice makes itself.
The SIXSIM is the clearer fit here — it's rated for up to 60W PD charging and built to regulate voltage and current while audio passes through. The MEE audio splitter also supports simultaneous audio and charging, but SIXSIM publishes a specific charging figure, so it's the one I'd lean toward if fast charging matters most.
That's the real decision. SIXSIM gives you a 3.5mm audio jack plus a USB-C charging port, so it suits traditional wired earphones. MEE audio gives you two USB-C female ports, so it suits USB-C headphones or a USB-C DAC. Match the adapter to the plug on your headphones.
Value depends on what you already own and what each costs today, so check the current price on Amazon before deciding. On paper, SIXSIM includes two adapters and 60W PD charging, while MEE audio offers a single unit with a 1-year manufacturer warranty from an established audio brand — weigh the spare against the warranty.
Both list iPhone 15/16/17, Samsung Galaxy, iPad and Pixel among their compatible devices, so platform isn't the tiebreaker. The difference is the connector: pick SIXSIM for 3.5mm headsets, or MEE audio for USB-C audio gear.
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