[2-in-1 Bluetooth Transmitter and Receiver] The Bluetooth transmitter supports Bluetooth transmission and reception, i.e., TX and RX modes. RX mode supports the use of two devices at the same time, such as car audio and home audio, while TX mode supports the operation of one device at the same time, such as PC. [Bluetooth 5.3-Farther and Faster] This wireless 5.3 USB Bluetooth adapter provides a stable connection of 10 meters, providing clear, practical and pleasant sound (Note: Phone calls are only supported in RX mode, not TX mode). [Wide Compatibility] This 3.5mm Car Bluetooth USB Adapter is compatible with devices with 3.5mm and USB A interfaces. RX mode can be used for car audio, home audio, audio music streaming audio system, amplifier, speaker and headphones, while TX mode can be used for PC, desktop, MP3, MP4, switch, etc. [Plug and Play] The 2-in-1 Bluetooth USB Adapter for Car does not require the installation of drivers for any compatible device. [Ultra-compact and portable] With an ultra-compact and lightweight design, you can easily carry this Bluetooth audio adapter by putting it in your pocket or bag. Colour:Black Material:Plastic Package Contents: 1 * Bluetooth Adapter 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.