We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-17 · 7 min read · Independent comparison
If you want a self-contained wireless gaming headset that kills lip-sync lag on PS5, Switch or PC, choose Avantree C519M; if you need a tiny adapter that makes an airplane seat, TV, treadmill or car stereo Bluetooth so you and a friend can both listen, choose Nulaxy 2-in-1.
• Avantree C519M — biggest strength: it's a complete, pre-paired over-ear headset plus USB-C transmitter set, so you get audio lag under 40ms and 16-bit stereo chat that doesn't degrade when you talk and game at the same time.
• Avantree C519M — biggest trade-off: it only works where there's a USB-C audio output, and it's explicitly not compatible with TV, Xbox One or PS3, so it can't rescue an older living-room setup.
• Nulaxy 2-in-1 — biggest strength: a display screen that shows pairing status and mode, plus dual-headphone sharing, so two people can listen to the same in-flight movie or TV without splitters.
• Nulaxy 2-in-1 — biggest trade-off: it's an adapter only — no headphones included — and every source you use it with still needs a 3.5mm AUX or wired audio output.
• Pick Avantree C519M if you want one box that solves wireless gaming audio and voice chat end to end.
• Pick Nulaxy 2-in-1 if you already own good headphones or earbuds and want to free them from wires on planes, TVs, treadmills and car stereos.
The C519M is a bundle, not just a headset. You get the AS9M over-ear headphone and the C51 USB-C Bluetooth dongle, and the two arrive pre-paired. That matters more than it sounds. Anyone who has fought a Bluetooth menu on a console knows the pain of pairing a headset that then refuses to reconnect. Here you plug the dongle into a USB-C port, power the headphone on, and you're running. No driver install, no pairing dance.
The headline spec is latency. Avantree rates the built-in low-latency link between dongle and headphone at under 40ms, against roughly 220ms for standard Bluetooth. In practice that's the difference between gunfire landing with the muzzle flash and gunfire arriving a beat late. If you play anything timing-sensitive, or you just can't unsee a badly dubbed movie, that number is the whole point of this product.
The second thing I'd flag is the chat quality claim. The C519M is built so that when you talk and listen at once — Discord plus game audio, or a call with music underneath — the audio stays 16-bit stereo rather than collapsing into thin, muffled mono the way a lot of Bluetooth adapters do. The adapter also auto-switches between music mode and talk mode based on what you're doing, so you're not tapping buttons mid-match.
Who should buy it: PS5, Switch, Mac, PC, Chromebook and Linux users who want wireless game audio and voice chat sorted in one purchase. It's compatible with anything that pushes audio out of a USB-C port. Who should skip it: anyone hoping to Bluetooth-enable a TV, or an Xbox One or PS3 owner — Avantree states plainly that these aren't supported. Also skip it if you want active noise cancelling; the sheet lists noise control as none.
Nulaxy 2-in-1: Who It's For
The Nulaxy 2-in-1 solves a completely different problem. It's a transmitter/receiver adapter: in TX mode it takes audio from a wired source — a TV, an airplane seat jack, a PC — and beams it to your Bluetooth headphones. In RX mode it goes the other way, taking audio from your phone and pushing it into a car stereo or a wired speaker. That two-way flexibility is why it's called 2-in-1, and it's genuinely useful if you own one set of good headphones and want them to work everywhere.
The feature I'd actually point a friend to is the screen. It shows pairing status, the name of the connected device and the current working mode. That sounds minor until you've spent ten minutes on a plane guessing whether a blinking LED means "pairing" or "low battery." A screen removes the guesswork and makes one-click pairing realistic.
Then there's dual-headphone sharing. Two Bluetooth headphones can connect at the same time, so a couple can watch the same in-flight movie or the same TV without a splitter cable and without one person giving up their earbuds. For family travel or a shared treadmill setup, that's the killer feature.
Under the hood it uses a Qualcomm chipset for broader compatibility, a more stable link and better resistance to interference, with low-latency technology to keep audio and video in sync. Battery is rated up to 20 hours in receiver mode and 15 hours in transmitter mode. It's compact, black, and backed by a 1-year manufacturer warranty.
Who should buy it: frequent flyers, people with a wired car stereo or older TV, treadmill and home-gym users, and anyone who already loves their own headphones. Who should skip it: gamers who need a mic and a headset in the box — there's no headphone and no microphone here — and anyone whose source has no 3.5mm or wired audio output at all, because the adapter needs something to plug into.
• Best for wireless gaming with voice chat → Avantree C519M. The 16-bit stereo chat handling and sub-40ms link are built for exactly this.
• Best for sharing audio with a second person → Nulaxy 2-in-1. Dual headphone connection is a native feature; the C519M is a single-headphone set.
• Best for battery life → Avantree C519M. 40 hours per charge at 60% volume versus 20 hours in RX and 15 hours in TX mode.
• Best for airplane and travel use → Nulaxy 2-in-1. The 3.5mm AUX input, display screen and compact body are made for seat-back jacks.
• Best for TV and older stereo setups → Nulaxy 2-in-1. The C519M is not compatible with TV at all.
• Best for PS5, Switch, Mac, PC, Chromebook and Linux → Avantree C519M. Any USB-C audio output works, plug and go.
• Best for people who already own headphones → Nulaxy 2-in-1. It upgrades what you have instead of replacing it.
• Best for a single all-in-one purchase → Avantree C519M. Headphone, mic and transmitter ship together, pre-paired.
In my opinion, the Avantree C519M is the one I'd buy for myself, because it's the only one of the two that solves the whole chain — wireless audio, low latency and a working mic — without me owning anything else first. The sub-40ms figure and the no-degradation stereo chat are the reasons, and the 40-hour battery means I'm not babysitting a charger.
That said, the Nulaxy 2-in-1 is the smarter buy if your problem is a wired TV, a car stereo or a plane seat, or if you simply want two people listening together. Different jobs, both done well. Buy the C519M for gaming on USB-C hardware; buy the Nulaxy for turning wired audio wireless wherever you go.
Avantree C519M. It's designed around USB-C audio output and works with PS5, Switch, Mac, PC and Chromebook. The Nulaxy 2-in-1 is an adapter for wired audio sources and doesn't include a headset or mic.
Yes. Dual headphone sharing is a core feature, so two Bluetooth headphones can listen to the same source simultaneously. The Avantree C519M is a single-headphone set with no second-headphone pairing.
No. Avantree states it's not compatible with TV, and also not with Xbox One or PS3. If TV audio is your main use case, the Nulaxy 2-in-1 is the appropriate pick.
Yes — pricing shifts often and I don't publish figures here. Use the price button on this page to see the live cost on Amazon for whichever model you've settled on.
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