This wireless 5.3 USB Bluetooth adapter provides a stable connection of 10 meters, offering clarity, practicality, and pleasant sound (note: phone calls are only supported in RX mode, not in TX mode). RX mode supports simultaneous use of two devices, such as car stereo and home stereo, while TX mode supports simultaneously operating a device, such as a computer. This 3.5mm car Bluetooth USB adapter is compatible with devices with 3.5mm and USB A interfaces. No need to install drivers for any compatible devices. Featuring an ultra compact and lightweight design, this Bluetooth audio adapter can be easily carried in a pocket or bag. TX mode usage steps: 1. Plug in the USB port for power and turn the switch to TX (red light). 2. Connect the other end to the 3.5mm audio port of the TV. 3. Turn on the Bluetooth headset and make sure it is in pairing mode. 4. Bring it close to the USB transmitter and wait for automatic pairing. 5. Now you can enjoy TV without disturbing others! Specifications: Interface: 3.5mm Aux jack Bluetooth: V5.3 Effective Range: 10m/30ft Installation: Plug & play What is inside the box: 1 USB Bluetooth adapter 1 3.5mm audio cable 1 user manual (Note: Please note that some devices may not be compatible with this product, and Bluetooth connection may have low latency phenomenon. If you have any questions, please contact us. Thank you.)