Sennheiser BTD300Audio Bluetooth Audio Transmitter

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.