Features: Multi-device expansion: Bluetooth receive/transmit mode & fiber coaxial digital-to-analog conversion. U disk/AUX audio input, multi-device expansion interface, to meet different needs. Easy connection of old-fashioned speakers: Connect old-fashioned speakers or amplifier AUX/RCA interface to solve the problem that the speaker has no Bluetooth and cannot be played using Bluetooth. Support all kinds of TV: solve the problem that the TV cannot be connected to the Bluetooth headset, connect to Bluetooth in one second, and watch the football game at night without worrying about disturbing the rest of the family. With Remote control: equipped with infrared remote control anytime, anywhere, you can operate it however you want. 30M barrier-free transmission Bluetooth transmission: 30M barrier-free and stable transmission, music without delay，Strong signal, so that the room connection without dead ends. Specifications: Product Name: Bluetooth Adapter Bluetooth version: 5.1 Transmission distance: 30 meters Operation mode: Button+Remote Control Audio interface: Coaxial, Fiber Optic, USB Drive, 3.5MM/AUX, R/L RCA Input voltage: DC 5V Power supply port: Type-c Product material: Aluminum Alloy Product size: approximately 107 * 52 * 21mm/4.21 * 2.05 * 0.82 inches Packaging includes: 1 * Bluetooth adapter 1 * 3.5MM audio cable 1 * Remote control (with CR2025 button cell) 1 * Fiber optic cable 1 * Type-c cable Note: 1. The product does not have a built-in battery and requires a USB power cable for power supply! 2. Due to manual measurement, please allow a measurement deviation of 1-2cm! 1. 4 in 1 bluetooth audio adapter, supporting bluetooth receiver, bluetooth transmitter, digital to analog conversion, and USB playback. Meet the daily use of various devices. 2. Bluetooth receiver adapter, supporting audio transmission through Bluetooth pairing with mobile devices such as phones and tablets. 3. Bluetooth transmitter adapter, you can use it on TV/computer/TV box/PS/switch. 4. DAC converter, supporting signal conversion from digital optical coaxial audio to RCA 3.5mm or R/Analog audio. 5. USB drive playback, no driver required, plug and play, supports MP3/APE/FLAC/WAV/WMA music format (does not support folder playback).