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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want a dedicated, no-compromise charging setup for your Shokz bone conduction headphones, choose gudxfj 2; if you need one small adapter that lets a modern USB-C phone charge and output wired audio at the same time, choose Luntak 2. These two products barely overlap in purpose, so the right pick comes down to what problem is actually sitting on your desk.
• gudxfj 2 — biggest strength: Two replacement magnetic charging cables (one USB-A, one USB-C) built specifically for Shokz/Aftershokz bone conduction models, so you can charge from a wall adapter, laptop, car or power bank.
• gudxfj 2 — biggest trade-off: It only charges Shokz-style bone conduction headphones. It does nothing for audio output, and it will not fit any other brand or connector type.
• Luntak 2 — biggest strength: A 2-in-1 USB-C dongle that splits one USB-C port into a 3.5mm headphone jack plus 60W PD charging, with a 3A current rating and support for a very long list of phones and tablets.
• Luntak 2 — biggest trade-off: It is a single compact adapter (roughly 5.51 x 0.79 x 0.28 inches) rather than a cable set, so you get one unit, not a spare, and it depends entirely on having a USB-C port to plug into.
• Who gudxfj 2 is for: Anyone who already owns Shokz OpenRun, OpenRun Pro, OpenRun Mini, OpenComm or Aftershokz Aeropex headphones and wants a spare or second charging cable.
• Who Luntak 2 is for: Anyone with a USB-C phone or tablet that dropped the headphone jack and wants wired headphones and charging at the same time.
The gudxfj 2 is a two-pack of replacement charging cables for Shokz and Aftershokz bone conduction headphones. Each cable is 3.3 feet long, black, and uses a magnetic charging module that snaps onto the headphone's charging contacts. The set includes one cable with a USB-A port and one with a USB-C port, which is the detail I like most here: you can leave one plugged into a laptop or power bank and keep the other with a wall adapter or car charger.
Who should buy it: existing Shokz owners who lost a cable, want a backup in a bag or car, or are tired of unplugging one cable from the laptop to take it on a trip. Two cables of different port types genuinely solves that. Who should skip it: anyone who does not own a Shokz or Aftershokz bone conduction headphone, and anyone hoping to charge something else or pass audio through it. It charges headphones. That is the job, and it does only that job. Before buying, check your exact headphone model against the compatibility list, because the magnetic connector is shaped for that specific charging port.
Luntak 2: Who It's For
The Luntak 2 is a different animal entirely. It is a 2-in-1 USB-C adapter that gives you a 3.5mm headphone jack and a USB-C PD charging port from a single USB-C socket. It handles up to 60W PD fast charging with a 3A current rating, and it is a small dongle-style unit — about 5.51 x 0.79 x 0.28 inches in silver. The package contains one adapter.
The compatibility list is the reason to consider it. It covers iPhone 15/Plus/Pro/Pro Max and iPhone 16/Plus/Pro/Pro Max, the Galaxy S8 through S25 family including the S25 Edge, Ultra and Plus variants, Galaxy Note 7 through Note 20 Ultra, Galaxy Z Flip 2-6, iPad Pro, iPad mini 6, Google Pixel 8 and 7, and various Huawei Mate and P series phones. It is also listed for car audio and video, tablets and microphones, which tells you the 3.5mm side is meant to feed more than just earbuds — a car aux input, a wired mic or a headset all make sense.
Side-by-Side: Which Should You Choose?
• Best for charging Shokz bone conduction headphones → gudxfj 2. It is built for that magnetic connector and nothing else.
• Best for phones without a headphone jack → Luntak 2. It restores 3.5mm audio on USB-C devices.
• Best for listening and charging at once → Luntak 2. The 60W PD passthrough plus 3.5mm output is the entire point of the design.
• Best for a spare cable in your bag or car → gudxfj 2. Two cables, two different port types, 3.3 feet each.
• Best for travel with a single compact accessory → Luntak 2. One small dongle versus two cables.
• Best for car aux audio from a modern phone → Luntak 2. Wired output to a car stereo is exactly what it is listed for.
• Best for long-term durability against daily flexing → gudxfj 2. The ABS/PVC jacket, copper wire and tangle-free build are aimed at repeated daily plugging.
• Best if you own both kinds of gear → both. They solve unrelated problems; there is no conflict in owning each.
In my opinion, the honest answer is that these two products are not really competitors — they are answers to two different questions. If your problem is a Shokz headphone that needs charging and a cable that keeps going missing, I would buy the gudxfj 2. Two cables, one USB-A and one USB-C, at 3.3 feet, with a magnetic connector made for that exact headphone family, is the practical fix. If your problem is a USB-C phone with no headphone jack and a wired headset you refuse to give up, I would buy the Luntak 2, because the charging passthrough is what separates it from a basic dongle. Buy the one that matches the device in your hand.
FAQ
Yes. That is its main feature: 3.5mm audio output plus USB-C PD charging up to 60W from a single USB-C port. A plain USB-C-to-3.5mm dongle usually occupies the port and blocks charging, which this adapter avoids.
No. It is a USB-C adapter, listed for iPhone 15 and iPhone 16 series and USB-C iPads. Older Lightning-based iPhones are not supported.
They are not comparable on value because they do different jobs. Judge each against what you need: gudxfj 2 gives you two replacement charging cables for Shokz headphones; Luntak 2 gives you one audio-plus-charging adapter for USB-C devices. Check the current price on Amazon for each and compare against how often you would actually use it.
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