

✈️ Elevate your in-flight audio game—wireless freedom at 30,000 feet!
The Avantree Relay is a Bluetooth 5.3 transmitter designed specifically for airplane entertainment systems, enabling wireless audio streaming via a 3.5mm AUX connection. It supports pairing two Bluetooth headphones or AirPods simultaneously, powered by Qualcomm aptX Adaptive for superior sound quality and minimal latency. With up to 25 hours of battery life, it’s perfect for long-haul travelers seeking a premium, tangle-free listening experience.













| ASIN | B0DMFB3VJZ |
| Best Sellers Rank | 341 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 3 in Audio & Video Adapters |
| Box Contents | Relay Bluetooth Transmitter, Type C Charging Cable |
| Brand Name | Avantree |
| Color | Midnight Blue |
| Compatible Devices | Airline Entertainment System, Gym Machine, Headphone |
| Country of Origin | China |
| Customer Reviews | 4.4 4.4 out of 5 stars (5,756) |
| Data Link Protocol | Bluetooth |
| Hardware Interface | Bluetooth 5 |
| Manufacturer | Avantree |
| Manufacturer Part Number | BTTC-218-BLU |
| 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 |
| Unit Count | 1.0 Count |
T**N
Expensive, but well worth it: Great sound quality and long lasting!
This Relay kit has become an essential part of my travel kit. The Bluetooth adapter is fantastic, especially for long flights and the sound quality is top-notch, giving clear and crisp audio without any noticeable lag. One of the best features is its battery life – it lasts throughout my long flights (14hrs plus and it barely went down one bar) without needing a recharge. It's easy to connect if you follow the instructions and worked perfectly with Apple AirPods. Pleasantly surprised, and definitely made long flights more comfortable!
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.
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.
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**E
A solution to a problem!
Great product. I purchased this product so my wife and I could enjoy tv and films together as she is hard of hearing in one ear and requires the sound too high for me to bear. This product allows us to connect two pairs of headphones to the tv and therefore we can adjust sound individually. A lifesaver! Easy to use and a perfect solution.
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
J**I
Paired both pairs of headphones to laptop
After I didn't check i could bluetooth 2 pairs of Sony noise cancelling headphones to my laptop before a flight last year,I found out that wasn't possible 30,000ft in the air! I tried using Voicemeeter but i got inconsistent results and sound levels. Paired the Avantree Relay, works straight out of the box, sounds great and appears its good for 10hrs use without charging, which suits my needs.
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。
TrustPilot
2 周前
1天前