Advanced BT Technology: Featuring the latest BT 5.3 technology, this digital to analog audio converter adapter revitalizes your old stereo system, enabling BT support so you can stream music and control playlists directly from your smartphone Versatile Dual Mode: As a 2-in-1 BT transmitter and receiver, the digital to analog audio converter enables non-BT audio sources like , computers, and projectors to send audio to BT speakers and headphones in TX mode, while RX mode allows it to receive audio from BT devices and output it to non-BT speakers via AUX Plug-and-Play Simplicity: With USB plug-and-play functionality, you can enjoy easy and convenient use without the need for driver installation. Simply plug the digital to analog audio converter in, and audio is instantly transmitted Stable Signal Transmission: The digital to analog audio converter adapter's built-in antenna ensures a stable and smooth connection, maintaining long-distance connectivity without interruption in open environments, while delivering audio with no delay Intuitive Control Design: The optical coaxial digital to analog audio converter's button design supports volume adjustment, allowing you to power the device on and off and adjust the volume up or down with a simple knob, providing easy and precise control BT version:BT V5.3 Supported protocols: RX: A2DP AVRCP TX: A2DP Working frequency band: 2.402GHz-2.480GHz Power level: Power level 2 (Class II) USB flash drive plug and play, knob to adjust volume, wireless remote control Multiple interfaces: AUX/coaxial/optical fiber/USB flash drive interface BT distance: 10M (open space) (The product appearance and printed words depending on the batch, but this does not affect use) Color:As shown Material:ABS Package Contents: 1 * Converter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.