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Upgrade Your Travel & Gym Audio Experience
Avantree Relay is a Bluetooth audio transmitter designed for airplane entertainment systems, gym equipment, and other 3.5 mm audio sources. Connect one or two pairs of Bluetooth headphones or earbuds, control volume on the device, and listen for up to 25 hours. Qualcomm aptX Adaptive and aptX HD are supported with compatible headphones. Relay transmits audio only; it has no microphone and is not designed for phone calls, TVs, hearing aids, musical instruments, or Bluetooth audio receiving.
Experience clear, stable wireless sound with Qualcomm aptX Adaptive and aptX HD support, ensuring detailed audio with compatible headphones. The 25-hour battery life is perfect for long-haul flights, and onboard volume controls offer convenient adjustments. Reviewers praise its reliability for sharing audio on flights.
This transmitter is ideal for travellers seeking to enjoy in-flight entertainment or gym workouts with their preferred Bluetooth headphones. All customs duties and GST are included in the price. Delivery is via ExpressBox, tracked to your pincode.
Advanced Audio Technology for Travelers
Avantree Relay utilizes Qualcomm aptX Adaptive and aptX HD technologies to ensure a stable, high-fidelity wireless audio connection. This means less lag and clearer sound, especially crucial for movies or music on long flights. Unlike basic transmitters, it supports dual-link, allowing two people to listen simultaneously. The 25-hour battery life far exceeds typical travel needs, and onboard volume controls provide convenience without needing to adjust your source device. It's designed for audio transmission only, focusing on delivering the best possible sound quality from your 3.5mm audio sources.
Who It's For vs. Who Should Skip It
This transmitter is ideal for frequent flyers, travelers, and gym-goers who want to use their own Bluetooth headphones with airplane entertainment systems, treadmills, or other 3.5mm audio jacks. It's perfect for sharing audio with a companion. Skip this device if you need to transmit audio from a TV, use it for phone calls (it has no microphone), connect to hearing aids, or use it with musical instruments. It is strictly an audio transmitter, not a receiver or a headset.
Typical situations where Avantree Relay Bluetooth Transmitter for 2 Headphones | 25-Hour Battery helps — illustrative scenarios, not customer reviews.
A couple travelling from Delhi to London on a long-haul flight.
They can both connect their individual Bluetooth earbuds to the airplane's entertainment system using the Avantree Relay, enjoying movies together wirelessly with clear, stable audio thanks to aptX Adaptive technology.
A fitness enthusiast at a Mumbai gym wants to use their Bluetooth headphones with the treadmill's audio system.
The Relay easily plugs into the treadmill's 3.5mm jack, transmitting audio to their headphones. The 25-hour battery ensures it lasts through multiple workouts without needing a recharge, and onboard volume controls are convenient.
| Battery Type | Rechargeable Lithium-Polymer |
| Battery Capacity | 0.8 Wh (approx. 4.4g) |
| Battery Life | Up to 25 hours |
| Charging Time | Approx. 2 hours |
| Power Source | USB-C Charging (cable included) |
| Cost per use | 25 hours of use at ₹8,060 — ₹322 per hour |
| Shelf life after opening | 12 months (typical for electronics) |
| Reapplication math | N/A (device) |
| Contraindications | Not for phone calls, TVs, hearing aids, musical instruments, or receiving audio. |
| Allergens / common irritants | Contains ABS plastic; consult manufacturer for specific material sensitivities. |
| Feature | Avantree Relay Bluetooth | Others |
|---|---|---|
| Dual Headphone Support | Connects 2 Bluetooth headphones simultaneously | Most local transmitters support only 1 headphone pair |
| Audio Codec Support | Qualcomm aptX Adaptive & HD for high-fidelity, low-latency audio | Typically supports only basic SBC codec; higher latency |
| Battery Life | Up to 25 hours continuous playback | Generally 8-15 hours battery life |
| Volume Control | On-device volume adjustment for each headphone | Volume control usually relies solely on the connected headphones |
| Cost per hour of use | 25 hours of use at ₹8,060 — ₹322 per hour | Local transmitters typically cost ₹1500-3000, offering 10-15 hours of use |
| SKU | sum4285 |
| GTIN | 6945624905253 |
| Brand | Avantree |
| Model Name | Relay |
| Part Number | BTTC-218-BLU |
| Color | Midnight Blue |
| Material | Acrylonitrile Butadiene Styrene (ABS) |
| Dimensions (L x W x H) | 1.9 cm x 13.7 cm x 14.9 cm (0.75 in x 5.39 in x 5.87 in) |
| Weight | 91 g (0.2 lb) |
| Country of Origin | Not stated by manufacturer — US retail version, sourced from authorized US retailers and authorized brand partners |
About Avantree
Avantree specializes in high-quality Bluetooth audio solutions, focusing on reliable connectivity and superior sound for everyday listening and travel.
Compliance & Legal
No product-specific compliance warnings identified. Standard imported-goods terms apply: customs duties & GST paid; for personal use in India; follow the manufacturer's usage instructions on the packaging.
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This item:
Avantree Relay Bluetooth Transmitter for 2 Headphones | 25-Hour Battery, aptX Adaptive
8,060
This item
Avantree Relay Bluetooth Transmitter for 2 Headphones | 25-Hour Battery, aptX Adaptive
8,060
Total price:
25,650
You save 4,760 (16%) Extra3 items selected
3 items
25,650You save 4,760 (16%) Extra
| Attributes | Current |  |  |  | |||
|---|---|---|---|---|---|---|---|
| Spec | |||||||
| Price | 8,060 8,530 | 11,670 15,510 | 5,920 6,370 | 1,22,520 1,63,030 | 1,480 2,100 | 1,580 1,670 | 1,040 1,240 |
| Rating | 4.30(6,744) | 4.10(659) | 3.90(59) | 5.00(1) | 4.40(247) | 4.30(1,504) | 4.50(109) |
| Brand Name | Avantree | Avantree | USAV Solutions | HP | TYHJ | Saipomor | UHamn |
| Source | US Retail | US Retail | US Retail | US Retail | US Retail | US Retail | US Retail |
| Sold By | CrowCrowCrow | CrowCrowCrow | CrowCrowCrow | CrowCrowCrow | CrowCrowCrow | CrowCrowCrow | CrowCrowCrow |
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