This 4-in-1 USB Bluetooth receiver uses a high-performance 5.1 Bluetooth chip, the signal is stable and high-speed transmission, and it refuses to delay or freeze. Plug and play, more convenient and simple to use. HIFI high-definition decoding output, no freeze or delay. The sound quality is clear, the sound details are restored, and you can enjoy dynamic music. Scratch-resistant matte technology, small and portable body. Automatic memory function, which can store the paired device name, and the second time the mobile phone turns on Bluetooth, it will automatically connect to the adapter. Built-in high-performance ceramic antenna, barrier-free 15-20 meters long-distance transmission, strong anti-interference ability, more stable connection. Transmitter Mode (TX): Wirelessly transfer audio from your non-Bluetooth TV, home stereo system, or CD player to your Bluetooth headphones or speakers. PC Audio Transmitter ModePC: Wirelessly transfer audio from the PC, notebook to Bluetooth headset or speaker through USB port, no audio cable is required. Receiver Mode (RX): Wirelessly transfer audio from your Bluetooth-enabled phone, tablet, or computer toyour wired stereo, speakers, or headphones. Sound card mode (SC): USB external sound card, solve the problem of damage to the sound card of the computer, expand the AUX audio interface, and easily connect wired headphones/speakers/headsets. Pairing Name: K10 Pro Bluetooth Version: Bluetooth V5.1 Transmission Distance: Barrier-free 15-20 meters Interface Type: USB, AUX Material: ABS Color: Black Weight: 50g Size: 40 x 18 x 10mm Package List: 1 x Car Bluetooth Receiver