How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want a travel adapter that turns any airplane 3.5mm jack into a low-latency aptX HD stream for the headphones you already own, choose Avantree Relay & Voyager; if you need actual earbuds with adaptive noise cancelling, a clip-on open-ear fit and top-tier codec support, choose EarFun Air Pro 4+.
• Avantree Relay & Voyager — biggest strength: a Qualcomm chipset with aptX Adaptive and aptX HD plus Bluetooth 5.3, feeding audio from a 3.5mm AUX source (like an in-flight entertainment jack) into your existing Bluetooth headphones, with an OLED display and built-in controls for volume, pairing, reconnect and battery level.
• Avantree Relay & Voyager — biggest trade-off: it is not a pair of earbuds and not a general-purpose transmitter. Avantree states it is not compatible with phones, car stereos or hearing aids, so it is a focused travel accessory, not your everyday listening device.
• EarFun Air Pro 4+ — biggest strength: a hybrid dual-driver setup (10mm composite dynamic driver plus a FeatherBA balanced armature) on a Qualcomm QCC3091 SoC, certified for Snapdragon Sound with aptX Lossless, and also supporting LDAC, LC3 and LE Audio.
• EarFun Air Pro 4+ — biggest trade-off: it is a wireless-only design with no headphone jack, so it cannot plug into an airplane seat jack or any wired source — you need your own Bluetooth source device.
• Who each pick is for: the Avantree Relay & Voyager for flyers and gym-goers who want to keep using their own headphones; the EarFun Air Pro 4+ for someone who wants one pair of earbuds to do noise cancelling, hi-res streaming and even live translation.
Avantree's pitch here is narrow and honest: this is a small, battery-powered Bluetooth transmitter built around a 3.5mm AUX input. You plug it into a 3.5mm jack — the classic case being an airplane seat's entertainment port — and it streams that audio wirelessly to your Bluetooth headphones. The audio path runs through a premium Qualcomm chipset with aptX Adaptive, aptX Low Latency and aptX HD support, paired with Bluetooth 5.3 for connection stability. Avantree leans on its 20 years of wireless experience as the credibility behind the design, and the compact, pocket-sized, travel-ready build backs that up: this is a device meant to live in a carry-on or a gym bag.
The controls are more thoughtful than most travel adapters. You can adjust volume, pair, reconnect, clear the pairing history and check battery level from the adapter itself, and an OLED display plus LED indicators show you connection status and remaining charge. That matters on a long flight where you do not want to dig into a phone just to see whether your headphones are still linked.
Who should skip it: anyone hoping this replaces their earbuds. It has no earpieces and no built-in speakers. It also is not designed for phones, car stereos or hearing aids, so if your goal is streaming from your phone or upgrading a car's stereo, this is the wrong tool. It is an accessory, not a listening device.
EarFun Air Pro 4+: Who It's For
The EarFun Air Pro 4+ is a full wireless earbud system, and the spec sheet reads like a flagship checklist. The driver arrangement pairs a 10mm composite dynamic driver with an ultra-light FeatherBA balanced armature, angled at 11 degrees to reduce high-frequency attenuation — in plain terms, EarFun is engineering for a clearer, more accurate soundstage rather than just a bass-heavy thump. Processing runs on the Qualcomm QCC3091 SoC with Snapdragon Sound certification and aptX Lossless, plus LDAC, LC3 and LE Audio support for people whose phones handle those codecs.
Noise cancelling is the other headline. Adaptive hybrid ANC with EarFun's QuietSmart 3.0 detects ambient noise and adjusts cancellation in real time, rated to cut up to 50dB. That is the kind of figure aimed squarely at commuters, open-plan offices and flights. Connectivity is Bluetooth 6.0, and control is via app, touch or voice.
The fit is the genuinely different part. This is an open-ear, clip-on design rather than an in-canal bud: a C-shaped bridge (EarFun says it was tested through 20,000+ flexes) clips onto the ear without inserting anything into the ear canal. The widened bridge combines 40-degree ultra-soft silicone with a 0.5mm nickel-titanium memory wire, so you can stretch and rotate it to your ear shape. Each earbud weighs 5.5g. For anyone who finds traditional tips painful or prone to falling out, that is the whole argument for this model.
There is also real-time AI translation across 100+ languages through the EarFun Audio App, with Real-Time and Face-to-Face modes — a feature you will not find on a typical pair of earbuds, and one that requires the app to be updated.
Side-by-Side: Which Should You Choose?
• Best for airplane entertainment systems → Avantree Relay & Voyager. It takes the 3.5mm AUX output and transmits it to your Bluetooth headphones via aptX Adaptive/HD with Bluetooth 5.3.
• Best for noise cancelling → EarFun Air Pro 4+. Adaptive hybrid ANC with QuietSmart 3.0, rated up to 50dB of ambient noise reduction.
• Best for keeping your existing headphones → Avantree Relay & Voyager. It works with AirPods, Bose and other Bluetooth headphones rather than replacing them.
• Best for hi-res codec range → EarFun Air Pro 4+. aptX Lossless, LDAC, LC3 and LE Audio via the Qualcomm QCC3091 SoC.
• Best for comfort over long sessions → EarFun Air Pro 4+. An open-ear clip-on design with no ear-canal insertion, 5.5g per earbud and a flexible nickel-titanium bridge.
• Best for low-latency wireless audio from a wired source → Avantree Relay & Voyager. aptX Low Latency plus Bluetooth 5.3 is exactly the combination you want when audio and video drift apart.
• Best for travel-size convenience → Avantree Relay & Voyager. Pocket-sized, battery powered, with an OLED display and LED indicators for battery and connection status.
• Best for extra features → EarFun Air Pro 4+. Real-time AI translation in 100+ languages through the app is a genuinely unusual addition.
In my opinion these two do not really compete — they solve different problems, and the "better" one depends entirely on what you already own. If you fly and you love your current headphones, I would buy the Avantree Relay & Voyager: aptX Adaptive and aptX HD over Bluetooth 5.3, real controls, an OLED readout and a genuinely pocketable design make it the smarter travel accessory, and it costs you nothing in terms of replacing gear you already like. If you want earbuds that do everything — adaptive ANC, dual-driver sound, aptX Lossless and a clip-on open-ear fit — I would buy the EarFun Air Pro 4+. Just check the current price on Amazon before you commit, since the value calculation changes fast in this category.
which earbuds support aptx hd
The EarFun Air Pro 4+ supports the aptX family including aptX Lossless through its Snapdragon Sound certification and Qualcomm QCC3091 chip, along with LDAC, LC3 and LE Audio. On the Avantree side, the Relay & Voyager adapter supports aptX Adaptive, aptX HD and aptX Low Latency — but it is a transmitter, not a pair of earbuds, so it delivers those codecs to whatever aptX-capable headphones you connect.
If your earbuds are Bluetooth and you want to use them with a wired 3.5mm source — most commonly an airplane seat jack — yes, that is exactly what the Relay is for. If you only ever listen from your phone, you do not need it, and the EarFun Air Pro 4+ already handles wireless playback on its own.
Not directly. The EarFun Air Pro 4+ is a wireless-only design with no headphone jack, so it cannot plug into a seat's 3.5mm port. You would need a separate Bluetooth transmitter for that, which is precisely the gap the Avantree Relay & Voyager fills.
For comfort, the EarFun Air Pro 4+ has the edge on paper: an open-ear clip-on design that avoids inserting anything into your ear canal, a flexible nickel-titanium bridge and 5.5g per earbud. The Avantree Relay & Voyager is not worn on your ears at all — it is a small battery-powered adapter — so comfort there depends on the headphones you pair with it.
As an Amazon Associate I earn from qualifying purchases.
We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon and affiliated sites.
When you buy through links on this page, we may earn a commission from qualifying purchases at no extra cost to you.
Amazon and the Amazon logo are trademarks of Amazon or its affiliates. This site is an independent third-party review and is not affiliated with, endorsed by, or sponsored by Amazon or the product brands mentioned.
See also: audio Technica ATH-G1 vs EarFun Air Pro 4: APTX Adaptive, miccus Long Range vs Avantree Relay & SoundJet: APTX HD, YOCOWOCO aptX vs VEKJ