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Small black rectangular Bluetooth transmitter with 3.5mm plug and dual LED indicators

Scosche BTTC-218 Relay Bluetooth Transmitter Dual Link 25hr 3.5mm

SKU CH-D7ST-KHF0C

Bluetooth transmitter connects to 3.5 mm audio sources and streams to two headphones simultaneously with aptX Adaptive for up to 25 hours

  • Screen sizeRelay
  • Labor warranty1 Year
  • Adjustable low pass1. aptX-Adaptive Support; 2. Dual Link; 3. 25hr Playtime
  • Adjustable parametric bass EQ1. aptX-Adaptive Support; 2. Dual Link; 3. 25hr Playtime
  • Cable typeAuxiliary, Female-to-Male
  • Audio channelsDigital Bluetooth (aptX-Adaptive, aptX-Low Latency)
  • Streams in-flight audio to two headphones via 3.5mm jack
  • Qualcomm aptX Adaptive chip delivers clear, stable wireless sound
  • Up to 25 hours playtime with built-in volume controls
  • Firmware-upgradeable for better AirPods compatibility and dual-link stability
  • Includes dual 3.5mm adapter for most airplane seat screens

Airplane Seat Adapter

The Scosche BTTC-218 Relay connects to airline seatback screens through a 3.5mm AUX jack and streams audio wirelessly to Bluetooth headphones. It is built for travellers who want to use their own AirPods, Bose, or other wireless headphones instead of the airline's wired units. The device supports dual-link pairing so two listeners can share the same in-flight entertainment. It is not a receiver and cannot pair with phones or tablets.

Transmitter-Only Limitation

This unit functions solely as a Bluetooth transmitter; it does not receive audio from smartphones, tablets, or TVs. It is incompatible with hearing aids, musical instruments, and any scenario requiring real-time monitoring or two-way communication. The 3.5mm input is the only way to feed audio into the device. Buyers who want to stream from a phone to a speaker or add Bluetooth to a home stereo need a different type of adapter.

25-Hour Battery Life

A single charge delivers up to 25 hours of continuous playtime, covering long-haul flights and extended travel days. Built-in volume controls and a clear battery indicator let you manage listening without reaching for the seatback screen. The package includes a dual 3.5mm airplane adapter so no separate purchase is required. Firmware updates are supported to improve stability and headphone compatibility over time.

How it compares

Measured against everything we stock in Car Audio Accessories & Wiring, at today’s prices. Recalculated every night.

Price $50.99
Pricier than about 73% of the 2,768 comparable items (median $21.99).

Specifications

Product
Brand nameScosche
Model nameBTTC-218
Product typeCar
Display
Screen sizeRelay
Audio & video
Audio channelsDigital Bluetooth (aptX-Adaptive, aptX-Low Latency)
Audio inputs3.5 mm Audio Jack
Audio outputsBluetooth
Ports & slots
Cable typeAuxiliary, Female-to-Male
Power
Electrical ratingRelay
Power detailsBattery Powered
Size & build
Head unit sizeSingle DIN
Main materialAcrylonitrile Butadiene Styrene (ABS)
In the box
Included hardwareYes
More details
Adjustable low pass1. aptX-Adaptive Support; 2. Dual Link; 3. 25hr Playtime
Adjustable parametric bass EQ1. aptX-Adaptive Support; 2. Dual Link; 3. 25hr Playtime
Cut out diameterSmall
Inner hole diameter for wireSmall
Number of links to amplifier0
Team affiliation1 Piece

Questions about this item

Should I choose the single or dual 3.5mm adapter for my flight?

Use the included dual 3.5mm adapter for most airline seat screens; it plugs straight into the two-pin jack without extra parts.

What does the 25hr playtime mean on a long-haul trip?

The built-in battery lasts up to 25 hours per charge, covering most intercontinental flights with power left for layovers.

How does aptX-Adaptive affect audio over Bluetooth?

It adjusts bitrate in real time for stable, low-latency sound, so movies stay in sync and music keeps detail even in a crowded cabin.

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