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Sennheiser BTD300Audio Bluetooth Audio Transmitter — main product image
Sennheiser

Sennheiser BTD300Audio Bluetooth Audio Transmitter

★★★★★4.0 (9 reviews)

The Sennheiser BTD 300 turns any 3.5mm audio source into a wireless Bluetooth stream for your favorite headphones.

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Overview

The Sennheiser BTD 300 Audio Transmitter is a compact Bluetooth adapter that lets you wirelessly stream audio from any device equipped with a 3.5mm headphone jack. Whether you want to use your Bluetooth headphones with an older TV, a gym treadmill's audio output, an in-flight entertainment system, or a desktop computer lacking Bluetooth, the BTD 300 bridges the gap. Simply plug the transmitter into the headphone output, pair it with your Bluetooth headphones or earbuds, and enjoy cable-free listening.

The device runs on an internal rechargeable battery, keeping it self-contained and ready to go without the hassle of carrying spare batteries. Its small form factor — barely larger than a USB stick — means it slips into a pocket or travel kit without adding noticeable bulk. Setup requires no software or drivers; the BTD 300 handles pairing automatically and reconnects to known devices on power-up. For anyone looking to add wireless audio to gear that was never designed for it, Sennheiser's transmitter offers a straightforward, reliable solution backed by the brand's audio engineering heritage.

Specifications

Brand
Sennheiser
Model
BTD300Audio
Type
Bluetooth Audio Transmitter
Connector
3.5mm Headphone Jack
Power
Internal Rechargeable Battery

Pros & Cons

👍 Pros

  • Adds Bluetooth audio capability to any device with a 3.5mm headphone jack
  • Compact, pocket-sized design is easy to carry and use on the go
  • Internal rechargeable battery eliminates the need for disposable batteries
  • Simple plug-and-pair setup with no drivers or software required

👎 Cons

  • Only connects via 3.5mm jack, so devices without a headphone output are not compatible
  • Audio quality depends on the Bluetooth codec supported by your receiving headphones
  • Adds a small amount of latency inherent to Bluetooth transmission, which may be noticeable with video
  • Rechargeable battery is internal and not user-replaceable

Frequently Asked Questions

Turn on the transmitter and put your Bluetooth headphones into pairing mode — the BTD 300 will automatically discover and connect to them. Once paired, future connections happen automatically.
The internal rechargeable battery provides several hours of wireless streaming on a single charge, and it recharges via USB when depleted.
Yes, it plugs into any standard 3.5mm headphone output — including TVs, older computers, portable music players, and in-flight entertainment systems — and transmits the audio over Bluetooth.
The BTD 300 transmits stereo Bluetooth audio. For specific codec support details, check Sennheiser's product documentation, as codec availability can vary by hardware revision.

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