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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-25 · 7 min read · Independent comparison
• Long Run Technologies ANC – biggest strength: a complete listen-anywhere package. Bluetooth 5.4 wireless, active noise cancellation, a 40 mm hybrid driver rated 20 Hz–20,000 Hz, ENC mic for calls, a 3.5 mm cable for wired use, and a claimed 100-hour average battery life with a 2-hour charge time.
• Long Run Technologies ANC – biggest trade-off: it's over-ear and 375 g, so it's bulkier and heavier than earbuds or a dongle, and it only reaches 20,000 Hz at the top end — hi-res capable, but not beyond the standard ceiling.
• Seulliya USB C – biggest strength: a 15-pack of USB-C-to-3.5 mm adapters with a hi-res audio DAC built in, covering iPhone 15/16, Galaxy S-series, Pixel, iPad, MacBook and car aux inputs — one tiny part that unlocks wired audio everywhere.
• Seulliya USB C – biggest trade-off: it makes no sound on its own. No battery, no drivers, no mic — it's a converter, so its quality depends entirely on the headphones you already own.
• Who each pick is for: Long Run Technologies ANC for anyone who wants one pair of hi-res wireless headphones for commuting, calls and travel. Seulliya USB C for anyone with good wired headphones and a USB-C device that dropped the headphone jack.
Think of this as the all-in-one option. It's an over-ear headphone with leather (faux leather) cups in white, a foldable frame and a push-button control layout. The noise control is active, not passive, so it's built to cut down engine drone and office hum rather than just muffle it with padding. The wireless side runs Bluetooth 5.4, and there's an ENC built-in mic tuned for clear calls. For a buyer who takes meetings on the move or wants to answer a call without unplugging anything, that combination matters more than raw spec bragging.
The audio hardware is a 40 mm hybrid driver with a 20 Hz–20,000 Hz frequency range. That full-range sweep is the practical definition of hi-res-friendly listening: it covers the entire span the ear can hear, from deep bass to treble detail. It's the kind of tuning that suits pop, rock, podcasts and film dialogue rather than a bass-only thump. Add the low-latency claim and it becomes a reasonable companion for video and casual gaming on a phone, tablet or PC.
Skip it if you want something you can stuff in a jeans pocket, or if you specifically need a dongle to make an existing pair of wired headphones work with a jackless phone. That's a different job.
Seulliya USB C: Who It's For
This is a completely different category of product, and that's the point. The Seulliya USB C is a USB-C-to-3.5 mm headphone jack adapter, and it ships as a 15-pack. It has a single USB Type-C port on one end and a 3.5 mm aux output on the other, with a hi-res audio DAC dongle built in. In the white/USB-C finish, it's a small, light accessory you can leave attached to a cable, drop in a bag or keep plugged into a car's aux input.
The compatibility list is genuinely broad, which is its real selling point. It covers iPhone 15, 15 Plus, 15 Pro and 15 Pro Max, plus iPhone 16 and 16 Pro; Google Pixel 7, 7 Pro, 6, 6 Pro and 6a; Samsung Galaxy S23, S23+, S23 Ultra, S22, S21, S20 series, A53, A54, and the W23/W22/W21 and Z Flip 5/4/3/2 and Z Fold 5/4/3/2 families; MacBook Pro and MacBook Air 2020/M1/M2; iPad Pro 2022/2021/2020/2018, iPad Air 2020/2022, and iPad mini 2021. That's phones, tablets and laptops in one list — the modern devices that quietly removed the headphone jack.
Who should buy it: anyone with a decent pair of wired headphones or IEMs and a USB-C device that no longer has a jack. Also anyone who wants to keep using an aux cable in a car, or who wants a spare adapter in every bag so they're never caught out. The 15-pack format is unusually practical here — these adapters are the kind of thing that gets lost, borrowed or left in a glovebox, so having multiples is a feature, not filler. There's a 1-year warranty, which is reassuring for a small part that takes constant plugging and unplugging.
Who should skip it: anyone expecting it to produce sound on its own, or hoping it adds noise cancellation, a mic or a battery. It doesn't. It's a converter. If your headphones are already wireless, this does nothing for you. And if you're on a device with a physical 3.5 mm jack, you don't need it either.
Side-by-Side: Which Should You Choose?
• Best for calls and meetings → Long Run Technologies ANC. ENC built-in mic versus no mic at all on the dongle.
• Best for long trips away from a charger → Long Run Technologies ANC. A 100-hour average battery rating and a 2-hour charge time is genuinely trip-proof.
• Best for using headphones you already own → Seulliya USB C. It plugs wired 3.5 mm headphones into USB-C phones, tablets, laptops and car aux inputs.
• Best for hi-res wired listening → Seulliya USB C, assuming your headphones are good enough to show it. The built-in hi-res DAC is the whole reason to buy it.
• Best for all-in-one hi-res listening with no extra parts → Long Run Technologies ANC. 40 mm hybrid driver, 20 Hz–20,000 Hz, wireless or wired via the included 3.5 mm cable.
• Best for travelling light → Seulliya USB C. A tiny adapter versus 375 g of over-ear headphone.
• Best for multiple devices / households → Seulliya USB C. A 15-pack spreads across bags, cars and family members; the headphones are a single personal item.
If I had to pick one, I'd buy the Long Run Technologies ANC. It's a complete product — hi-res-capable over-ear sound, active noise cancellation, a call mic, Bluetooth 5.4, wired backup and a battery rating that lasts weeks of normal use. The Seulliya USB C is excellent at what it does, and if you already own great wired headphones plus a jackless phone, it's the smarter buy. But it solves one narrow problem, while the headphones solve the whole listening experience. In my opinion, the Long Run Technologies ANC is the one most people will actually get daily value from. Check the current price on Amazon for both before you decide — value is personal, and these two aren't competing for the same budget line anyway.
FAQ
what is hi res headphones
what is hi res audio headphones
It's the same idea: headphones built to handle high-resolution audio rather than just standard compressed streams. The practical markers are the driver and its frequency range. On the Seulliya side, the "hi-res" claim refers to the built-in DAC in the adapter, not to any headphone drivers, since the adapter has none.
which headphones support hi res lossless
Any headphone that covers the full 20 Hz–20,000 Hz band can carry hi-res lossless audio, provided your source and connection support it. The Long Run Technologies ANC fits that description on paper. For wired headphones you already own, the Seulliya USB C's hi-res DAC dongle is what lets a USB-C phone feed them a clean analog signal.
No. They do different jobs. Buy the Long Run Technologies ANC if you want wireless, noise-cancelling, hi-res over-ear listening in one package. Buy the Seulliya USB C if you want to keep using wired headphones or a car aux cable with a USB-C device that has no headphone jack.
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