We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-06 · 6 min read · Independent comparison
If you want a simple, dedicated replacement charging cable for a specific pair of bone-conduction headphones — and especially if you're setting up sleep headphones for Xbox sessions where you just need the headset topped up — choose WUNIAK Charging Cable; if you need to plug wired earphones for Xbox into a USB-C device while that same device keeps fast charging, choose Kemsky USB C Double.
• WUNIAK Charging Cable — biggest strength: a purpose-built magnetic USB charging cable made specifically for the MARLALL NOS 08W Swimming Bone Conduction Headphones, sold as a 2-pack with a built-in PTC voltage regulator to guard against overcurrent.
• WUNIAK Charging Cable — biggest trade-off: it only charges. There's no audio passthrough, no splitter function, and it only fits the MARLALL NOS 08W — it won't work with a phone, tablet, or any other headphone.
• Kemsky USB C Double — biggest strength: a true 3-in-1 adapter — dual 3.5mm jacks plus PD 60W fast charging, with a DAC chip rated up to 24bit/96kHz — so you can listen on wired earphones while your USB-C device keeps charging.
• Kemsky USB C Double — biggest trade-off: it's an audio-and-charging adapter, not a headphone charging cable. It won't recharge a bone-conduction headset and it needs a USB-C source device.
• Pick WUNIAK if you own the MARLALL NOS 08W and need a spare or replacement charging lead.
• Pick Kemsky if you want wired audio plus fast charging through one USB-C port.
This is a single-purpose accessory, and that's the whole point. The WUNIAK cable is a magnetic USB charging lead built for one specific product: the MARLALL NOS 08W Swimming Bone Conduction Headphones. If you've lost the original cable, or the one you have is frayed and unreliable, this is a direct replacement — not a universal cable you have to coax into fitting. It comes as a 2-pack, which is genuinely useful if you want one at home and one in a bag or car.
The practical details matter here. The cable is 60cm long, which is short enough to tuck into a bag pocket or a car console without tangling, and it charges from any standard USB power source — a PC, a laptop, a wall adapter. Inside, there's a PTC voltage regulator designed to prevent overcurrent from damaging the headphones, which is a sensible safeguard for a device you'd rather not fry. The connector is male-to-male and the cable is copper wire.
Who should buy it: someone who already owns the MARLALL NOS 08W and wants a reliable spare charging cable — full stop. Who should skip it: anyone expecting a general-purpose cable. It won't charge your phone, it won't carry audio, and it won't fit other headphones. If you're building out a sleep headphones for Xbox setup, this is the cable that keeps that specific headset charged between sessions — nothing more, and nothing less.
The Kemsky USB C Double is a different animal entirely. It's a 3-in-1 USB-C to dual 3.5mm adapter that lets you listen through wired headphones and fast charge your device at the same time, from the same port. The headline feature is PD 60W charging: the adapter has its own charging chip that reads what your device needs and adjusts voltage and current accordingly. That's the "listen while charging" promise, and it's a real convenience if your phone or tablet only has one USB-C port to give.
Audio is handled by a built-in DAC chip rated up to 24bit/96kHz — a step above the 16bit/48kHz you'd typically see in basic adapters — with noise reduction and higher-fidelity decoding. In practice, that means cleaner sound and less hiss when you're using wired earphones. The build is ABS with a durable cord, corrosion-resistant, and there's no software or driver to install; it's plug and play. It also ships with a 12-month warranty.
The compatibility list is broad: iPhone 17/16/15 series, Galaxy S23 through S26 Ultra, Pixel, iPad, MacBook Pro/Air 2024, XPS laptops, Surface Book 3, Steam Deck, Switch 2, and more. Who should buy it: anyone who wants wired audio and charging through a single USB-C port — commuters, gamers, students on a laptop, or someone who wants transparency mode headphone for Xbox use routed through a USB-C source. Who should skip it: anyone looking to charge a bone-conduction headset, or anyone whose device lacks USB-C.
Side-by-Side: Which Should You Choose?
• Best for charging the MARLALL NOS 08W → WUNIAK Charging Cable. It's built exclusively for that headset.
• Best for listening and charging at once → Kemsky USB C Double. Dual 3.5mm jacks plus PD 60W through one port.
• Best for a spare/replacement cable you can stash anywhere → WUNIAK Charging Cable. Compact 60cm length, sold as two.
• Best for travel and mixed devices → Kemsky USB C Double. Compact, lightweight, plug and play, wide device support.
• Best overcurrent protection for a headset → WUNIAK Charging Cable. The internal PTC regulator is there to guard the headphones.
• Best for a phone, tablet, or laptop → Kemsky USB C Double. WUNIAK won't touch those devices.
• Best for a no-fuss single-purpose fix → WUNIAK Charging Cable. If you just need the headset charged, this is it.
For most readers comparing these two, the deciding question isn't which is "better" — it's what you actually own. If you have a USB-C phone, tablet, laptop, or handheld and you want to run wired earphones for Xbox while the device keeps fast charging, I'd buy the Kemsky USB C Double. The 3-in-1 design, PD 60W charging, and the higher-spec DAC chip make it the more versatile tool by a wide margin. I'd only pick the WUNIAK Charging Cable if you specifically own the MARLALL NOS 08W and need a spare charging lead — in which case it's the right, purpose-built choice and nothing else will substitute for it. In my opinion, versatility wins for most people, so Kemsky gets my nod.
Charging speed depends on the headset and the power source, not the cable alone. The WUNIAK cable draws from any standard USB port — PC, laptop, or wall adapter — so a higher-output wall adapter will generally charge quicker than a low-power USB port. For USB-C gear, the Kemsky adapter supports PD 60W charging, which is a fast-charging standard.
Connect the headphones' charging cable to a powered USB source. For the MARLALL NOS 08W, the WUNIAK magnetic cable is the matching lead — plug the USB end into a PC, laptop, or wall mount. The internal PTC regulator is there to prevent overcurrent from damaging the headset.
Not inherently, provided the charging hardware regulates current properly. The WUNIAK cable includes a PTC voltage regulator designed to prevent overcurrent damage, and the Kemsky adapter has a charging chip that adjusts voltage and current to match the connected device, which is exactly the kind of regulation that protects electronics.
That depends on the Bose model and its own charging requirements — neither of these two products is made for Bose headphones. The WUNIAK cable fits only the MARLALL NOS 08W, and the Kemsky adapter is a USB-C audio/charging splitter for phones, tablets, and laptops. Check your specific headset's connector before buying either.
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