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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-01 · 7 min read · Independent comparison
• Conambo Headset's biggest strength: a complete, self-contained listening and calling device — dual-mic CVC8.0/ENC noise canceling, aptX HD playback, Bluetooth 5.1 with Qualcomm QCC3020, dual-device pairing, up to 16 hours of talk time and an 18-meter wireless range.
• Conambo Headset's biggest trade-off: it is built around one ear and phone-based communication, so it is not a travel accessory that shares audio between two people, and the 14.2 g / 18 g over-ear fit is a very specific style some people simply don't like.
• Avantree Relay & SoundJet's biggest strength: it turns any 3.5 mm AUX output — most obviously an airplane seatback jack — into a Bluetooth signal that two headphones or AirPods can share, with aptX Adaptive and up to 25 hours of playtime on a charge.
• Avantree Relay & SoundJet's biggest trade-off: it is a transmitter only, and Avantree explicitly states it is not compatible with TVs, hearing aids, musical instruments, phones or tablets, so it cannot replace a normal headset.
• Who Conambo Headset is for: remote workers, truckers, drivers and anyone who takes calls on a phone all day and wants one earpiece to do it.
• Who Avantree Relay & SoundJet is for: flyers — especially couples or travel partners — who want to use their own Bluetooth headphones with in-flight entertainment.
The Conambo K18 is a communication tool first and a music device second. Its headline claim is noise handling: a dual-mic setup using CVC8.0 and ENC that Conambo says blocks up to 96% of noise, aimed at people who "rely on mobile phone for on-the-go communication." That is the honest framing of this product — it exists so the person on the other end of the call hears you, not the road, the warehouse or the cab of a truck.
On the listening side, the aptX HD support is the spec that matters most here. aptX HD is a Bluetooth codec associated with CD-like quality and minimal compression, and Conambo pairs it with a dynamic driver rated from 20 Hz to 20,000 Hz. In plain terms: if your phone supports aptX HD, this earpiece is designed to take advantage of it rather than falling back to a basic codec. Bluetooth 5.1 with the Qualcomm QCC3020 chipset keeps the link stable, and dual-device connectivity means you can hold a phone and a laptop at the same time and switch between work calls and music without re-pairing.
Buy it if you want one earpiece for calls, light music, and moving around a home office, a truck or a jobsite. Skip it if you need to share audio with a second person, want stereo sound in both ears, or want to plug into a wired 3.5 mm source.
Avantree Relay & SoundJet: Who It's For
The Avantree Relay & SoundJet R1 is not a headset, and treating it like one is the fastest way to be disappointed. It is a Bluetooth transmitter that takes a 3.5 mm AUX input and broadcasts it wirelessly. Avantree is unusually direct about the limits: "Not compatible with TVs, hearing aids, or musical instruments. Bluetooth transmitter only — does not pair with phones or tablets." That single line tells you exactly who this is for and who should walk away.
The core use case is flying. Airplane seatback entertainment systems still hand you a 3.5 mm jack, and this adapter plugs into it and sends the audio to your own Bluetooth headphones — AirPods, Bose, whatever you already own. The genuinely useful feature is that it pairs two Bluetooth headphones at once, so a couple or two travel companions can watch the same movie side by side instead of splitting a cheap airline headset. If you have ever flown long-haul with someone and wanted to watch the same screen together, that is the problem this solves.
Audio runs on Qualcomm aptX Adaptive, which Avantree describes as delivering balanced sound and dependable wireless performance. It is a codec designed to adapt to conditions rather than demand a perfect link, which fits the noisy, crowded RF environment of a plane cabin. Battery life is quoted at up to 25 hours of playtime on a single charge — enough for a long international itinerary without hunting for a USB port.
Buy it if you fly often, already own good Bluetooth headphones, and want to use them with in-flight entertainment (or want to share a screen with a travel partner). Skip it if you need something to take calls, listen from your phone, or connect to a TV — none of those are supported here.
• Best for phone calls and voice clarity → Conambo Headset. Dual-mic CVC8.0 + ENC noise canceling is the entire point of the product.
• Best for aptX HD music playback from a phone → Conambo Headset. It is the only one of the two that is a playback device at all; the Avantree is a transmitter.
• Best for battery life on a single charge → Avantree Relay & SoundJet, at up to 25 hours versus Conambo's up to 16 hours of talking time.
• Best for sharing audio with a second person → Avantree Relay & SoundJet. Two headphones on one adapter, which Conambo simply cannot do.
• Best for wearing all day while you move around → Conambo Headset. 14.2 g, an over-ear hook and an 18-meter range make it a wearable; the Avantree is a small box that stays plugged into a seatback.
• Best for airplane seatback entertainment → Avantree Relay & SoundJet. 3.5 mm AUX in, Bluetooth out. That is its whole job.
• Best for dual-device multitasking → Conambo Headset. Bluetooth 5.1 with QCC3020 keeps a phone and a laptop connected at the same time.
• Easiest to buy wrong → Avantree Relay & SoundJet. If you want a headset, this is not one. If you want in-flight audio sharing, it is exactly right.
In my opinion, most people searching these two names together actually need the Conambo Headset, because it is a complete device: you put it on and you can take a call, listen to aptX HD audio, and stay connected to two devices for up to 16 hours. I would buy the Conambo K18 for work, driving, or a home office, where clear voice pickup matters more than anything else.
I would buy the Avantree Relay & SoundJet R1 only if I had a specific trip in mind — long flights, my own Bluetooth headphones, and ideally someone sitting next to me watching the same screen. It is a specialist tool, and it is excellent at that one job. Just don't expect it to do anything else.
which earbuds support aptx hd
Of these two, only the Conambo Headset is an earbud-style listening device, and its data sheet lists aptX HD support for CD-like sound quality with minimal compression. The Avantree Relay & SoundJet is a Bluetooth transmitter, not an earbud, so it is not something you wear in your ears. If aptX HD playback from your phone is your priority, the Conambo is the relevant product here.
can I use the Avantree Relay with my phone or TV?
No. Avantree states plainly that the Relay & SoundJet is a Bluetooth transmitter only, and that it is not compatible with TVs, hearing aids, musical instruments, phones or tablets. Its input is a 3.5 mm AUX connection, which is why it is positioned for airplane seatback systems and similar wired audio sources.
Yes. Conambo lists dual-device connectivity powered by Bluetooth 5.1 and the Qualcomm QCC3020 chipset, so it can stay connected to two devices and switch between them — for example a phone and a laptop. That makes it practical for remote workers who move between calls and music without re-pairing.
The Conambo Headset is rated for up to 16 hours of talking time and charges in about 1.5 hours. The Avantree Relay & SoundJet is rated for up to 25 hours of playtime on a single charge, which Avantree positions for long international flights. Different jobs, different endurance numbers.
If either one sounds like your use case, check the current price on Amazon before you commit — the button on this page will take you there.
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