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Updated: 2026-09-20 · 7 min read · Independent comparison
If you want a two-pack replacement charging cable built specifically for Shokz and AfterShokz bone conduction headphones, choose gudxfj 2; if you need to listen to USB-C headphones and charge your phone at the same time through one port, choose Marsno USB C Splitter.
• gudxfj 2 — biggest strength: a two-pack of 3.3 ft magnetic charging cables that are explicitly compatible with a long list of Shokz and AfterShokz models, with one USB-A port and one USB-C port in the box.
• gudxfj 2 — biggest trade-off: it charges and nothing else. It cannot play audio, and it only makes sense if you already own a compatible bone conduction headset.
• Marsno USB C Splitter — biggest strength: one USB-C port in, two out — a USB-C audio jack plus a PD charging path rated up to 60W, with a HiFi DAC chip on the audio side.
• Marsno USB C Splitter — biggest trade-off: it is audio and charging only. No data transfer, no video output, no dual headphones, and a fairly long list of devices and use cases it does not support.
• Who gudxfj 2 is for: Shokz or AfterShokz owners who want a spare cable (or two) that snaps on magnetically and works from a wall adapter, laptop, car charger or power bank.
• Who Marsno USB C Splitter is for: people with a USB-C phone, tablet or laptop that has no headphone jack, who want wired audio without giving up charging.
The gudxfj 2 is a purpose-built replacement cable. It uses a magnetic charging module that snaps into place on the headset, which is the same basic approach the original Shokz charging cables use. The build is ABS and PVC with copper conductors, and gudxfj says the cable includes a power protection chip for safer, more stable current. Each cable is 3.3 feet long and black, and the set weighs about 34 grams total.
The compatibility list is the real story here. gudxfj names the AfterShokz Aeropex AS800, OpenComm ASC100SG, Shokz OpenRun Pro, OpenRun, OpenRun Mini, and OpenRun Pro Mini, and the description also mentions AS803, AS660 and AS661. If you own one of those, you know the drill: the charging cradle is proprietary, and losing the cable means the headset becomes a paperweight until a replacement arrives. That is exactly the gap this two-pack fills. One cable in the bag, one at the desk, and you are covered.
Marsno USB C Splitter: Who It's For
The Marsno USB C Splitter solves a different, very modern problem: the missing headphone jack. It is a 2-in-1 adapter with one USB-C audio port (audio only) and one USB-C charging port (charging only), so you can plug in wired USB-C headphones and keep the phone on a charger at the same time. That is the whole pitch, and for commuters, mobile gamers, and anyone stuck on long video calls, it is a genuinely useful trick.
The audio side uses a HiFi DAC chip, and Marsno describes lossless output with enhanced clarity and deeper bass. The charging side supports PD fast charging up to 60W. The connectors are aluminum alloy and the cable is braided, which matters for something that will live in a pocket or a bag pocket and get bent constantly. Marsno also backs it with a 24-month warranty and round-the-clock support.
The compatibility list is broad: iPhone 17/16/15 series, Samsung Galaxy S26 down through S21 and Note 20, Pixel 7 down to 4, iPad Pro, iPad Air, MacBook Pro and Air 2024, Huawei, Sony Xperia and more. But read the fine print, because it is unusually specific. No data transfer. No video output — no HDMI, VGA, DisplayPort, printers or hard drives. Not for two headphones or two chargers. The description explicitly rules out OnePlus phones, Amazon Fire Max, GoPro, Nintendo Switch, Motorola devices, cameras, projectors, dash cams and the Dell XPS 15. External microphones are not supported, calling does not work on phones that still have a 3.5mm jack, and inline controls and calling are not supported on the 2018 iPad Pro. If power is cut mid-use, the headset stops until you set playback again.
So who is it for? Someone who has already confirmed their device is on the supported list and who wants wired audio plus charging, nothing more. Who should skip it? Anyone hoping to move files, mirror a screen, or use it with a Switch, a GoPro, or a Motorola phone. It does one thing, and it does not pretend otherwise.
Side-by-Side: Which Should You Choose?
• Best for listening and charging at once → Marsno USB C Splitter. That is its entire reason to exist.
• Best for a phone with no headphone jack → Marsno USB C Splitter. Wired USB-C audio plus PD charging in one small dongle.
• Best for travel redundancy → gudxfj 2. Two cables, 3.3 feet each, one USB-A and one USB-C source end, so you are not hunting for the right brick.
• Best for audio quality ambitions → Marsno USB C Splitter. The HiFi DAC chip is the only audio-processing hardware in this comparison.
• Best for gaming while charging on a phone → Marsno USB C Splitter, keeping in mind it is not for the Nintendo Switch.
• Best for power banks, laptops and car adapters → gudxfj 2. It is designed to accept power from all of those sources.
• Best for a device not on the Marsno list → neither, in that specific case. Check your exact model against the support notes before buying either one.
In my opinion, these are not competitors so much as two tools for two different drawers. If I owned a Shokz OpenRun Pro or an Aeropex and my charging cable had gone missing, I would buy the gudxfj 2 without hesitating — two magnetic cables, a sensible length, and a compatibility list that actually names my headset. If instead I had a USB-C phone with no headphone jack and I wanted wired audio without sacrificing a charge, I would buy the Marsno USB C Splitter, provided my phone is on the supported list and I accept that it does audio and power only. One caveat before you decide either way: check the current price on Amazon, because the value math changes depending on what you are paying for a spare cable versus an adapter.
FAQ
Yes. gudxfj lists the Shokz OpenRun Pro, OpenRun, OpenRun Mini, OpenRun Pro Mini, AfterShokz Aeropex AS800 and OpenComm ASC100SG among the compatible models. The description also names AS803, AS660 and AS661. Always match your exact headset model before ordering.
No. Marsno states clearly that data transfer and video output are not supported — no HDMI, VGA, DisplayPort, printers or hard drives. It handles audio and charging only, and it will not work with two headphones or two chargers at once.
No. The description rules out OnePlus phones, Amazon Fire Max, GoPro, Nintendo Switch, Motorola devices, cameras, projectors, dash cams and the Dell XPS 15. It is aimed at mainstream USB-C phones, tablets and laptops from Apple, Samsung, Google, Huawei and Sony.
Ask what you are trying to fix. If a bone conduction headset needs a charging cable, the gudxfj 2 is the answer. If a phone or tablet needs to play wired USB-C audio while charging, the Marsno USB C Splitter is the answer. They overlap on the connector and nothing else.
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