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✈️ Elevate your in-flight audio game with wireless freedom and flawless sound!
The Avantree Relay is a premium Bluetooth 5.3 transmitter designed specifically for airplane entertainment systems. It connects via a 3.5mm AUX jack and supports dual headphone pairing, enabling two users to enjoy wireless audio simultaneously. Powered by Qualcomm aptX Adaptive technology, it delivers high-quality, low-latency sound with up to 25 hours of battery life—perfect for long-haul travelers seeking a clutter-free, immersive listening experience.













| ASIN | B0C3QQ4X6F |
| Best Sellers Rank | 533 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 4 in Audio & Video Adapters |
| Box Contents | Avantree Relay Adapter |
| Brand Name | Avantree |
| Color | Black |
| Compatible Devices | Bluetooth headphones or earbuds |
| Compatible Operating System Family | Android |
| Country of Origin | China |
| Customer Reviews | 4.4 4.4 out of 5 stars (5,844) |
| Data Link Protocol | Bluetooth |
| Hardware Interface | Bluetooth |
| Manufacturer | Avantree |
| Manufacturer Part Number | BTTC-218 |
| Model Number | BTTC-218 |
| Product Warranty | Warranty - 24 months (product registration to cover first 12m return shipment cost) | Extensive Support: Chat, Email, Phone, Online Clinic, Video Tutorials, FAQ and Registration - avantree.com/support |
B**D
Excellent Bluetooth adapter for flights and travel
I picked up the Avantree Relay mainly for use on flights, and it’s been very reliable so far. Setup is simple and quick, pairing easily with my Bluetooth headphones. Once connected, the audio has been stable with no noticeable dropouts or lag, even during long flights. Sound quality is very good for a Bluetooth adapter, and it works well for movies, TV shows, and general audio without sync issues. The adapter itself is compact and lightweight, making it easy to carry in hand luggage or a pocket. Battery life has been more than sufficient for long journeys, and I’ve been able to use it across multiple flights without needing to recharge in between. Build quality feels solid, and the physical controls are easy to use without needing to look at the device. It also works well beyond flights — I’ve used it with gym equipment and other non‑Bluetooth audio sources with consistent results. Overall, this is a well‑designed, dependable Bluetooth adapter that does exactly what it’s meant to do. A great option if you want wireless headphones to work properly with airplane entertainment systems or other wired audio sources.
V**S
Good Value
Works really well, fantastic for a flight and good price too, sound quality is good and it’s super compact and durable, no noise and it’s very versatile.
G**S
Would be five stars but for....
Works really nicely. Instructions are clear. Thanks for thinking to include a nice little travel bag. Would be five stars, but for the packaging unrecycleable at least in my location.
J**8
Simply lovely product
Simple to set up with AirPods, no lag in my tests. Product feels qood quality, comes with carry purse, two pin adapter and usb to usb c charge cable. Ours came fully charged. Sounds great too.
D**C
Worked as intended and a livesave on flights to Auss
Finally got to try this out on four long flights to Auss and back. Paired effortlessly with mu Bose NC headphones with no percevable delay to the sound. Made long flights much more enjoyable (?) With clear sound without the wire getting in the way. I was also surprised at how long the battery listed- not on the full flight but quite a lot of the 23 hrs each way and didn't run out!! Definitely a great buy and is now permanently in my headphones case. Didn't try pairing a second device, will try this next time. Small case to put it in is good too.
B**O
over priced and unreliable but mostly ok
Got this for a long haul flights and just had chance to test it. So it works ok, easy to pair. Weird things happen to my beats in ear headphones after a 30-40 minutes like a crackling noise or one ear dropping out, turning it on and off again fixes that. For the money I'd expect better but it's easily fixed by cycling the power. Comes well packaged and has a handy little pouch for the bits. Not great, but good enough for the use it'll get, definitely worth £10, but not £30
D**H
Great gadget
Wouldn’t be without this for long haul flights. My Bluetooth earphones sync to this easily and so you don’t have to use those cheap airline earphones.
R**Y
Good sound with AirPods 2- no/minimal latency.
Works really well with my AirPods 2. Minimal/No noticeable latency. Good sound quality and noise cancelling from the airpods2, much better than the airline-provided headphones. Have used it on Singapore airlines and Qantas both good. Initially (as advised) had to de-pair my AirPods from my iPhone to pair AirPods with the avantree, then re-pair with my iPhone. Both work fine now with my AirPods, so I can switch between my iphone and the Avantree without re-pairing my AirPods again. Very happy with the purchase.
T**U
Der Adapter kam sehr gut verpackt an. Die Einrichtung und die Verbindung mit den Kopfhörern ging sehr fix. Zudem ist die Anleitung auch verständlich. Im Flugzeug konnten wir den Adapter testen. Ergebnis einfach sehr gut. Akku hält lange, Übertragung ohne Verzögerung und in guter Qualität. Das verbinden weiterer Kopfhörer auch einfach. Zudem kann man zwei Kopfhörer sogar gleichzeitig nutzen. Für den Preis super. Vor allem kann man es ja auch außerhalb vom Flugzeug nutzen. Definitiv klare Kaufempfehlung
C**R
Bought it for a recent long airplane ride from Dubai to Canada. Was Flying on ITA Airways. Didn't need to use because ITA allows direct bluetooth connection, but I tested it on my laptop and it worked as stated. Only problem is trying to remember the directions to connect/pair since I don't use it very often.
M**A
muy buena compra, justo lo que necesitaba.
R**A
Perfect for aeroplane journeys. Works really well and strong Bluetooth connection.
無**名
2026年2月に購入し、10回ほど使用してますが、1度音声が聞こえなくなったものの再起動させたらすぐに直りました。 携帯のしやすさ、接続性ともに満足ですし、 出勤時、在宅勤務等でのTeams会議でとても重宝しています。(スマホ等でもTeams参加できますが、画面共有等で不便) まだ利用したことはないですが、機内での利用も楽しみです。
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