1. Transmitter Mode (TX): Wirelessly transfer audio from your non-Bluetooth TV, home stereo system, or CD player to your Bluetooth headphones or speakers. 2. PC Audio Transmitter Mode: Wirelessly transfer audio from the PC, notebook to Bluetooth headset or speaker through USB port, no audio cable is required. 3. Receiver Mode (): Wirelessly transfer audio from your Bluetooth-enabled phone, , or computer toyour wired stereo, speakers, or headphones. 4. Sound card mode (): USB external sound card, solve the problem of damage to the sound card of the computer, expand the AUX audio interface, and easily wired headphones/speakers/headsets. 5. Mini size: With anti-scratch process, the body is small and portable. Product Name: 4 IN 1 USB Bluetooth adapter Product version: Standard Product : K10 Pro Bluetooth Version: Bluetooth V5.1 Chip:AC6951C Transmission Range: 10-20m (barrier free) Interface: 3.5mm AUX Input Parameter: DC 5V-2.1A(MAX) Support Protocol: A2DP/AVRCP Product Dimension: about 40 x 18 x 10mm Using : Drive free Product Weight:Standard version:15g Support Devices: All kinds of speakers,desktop computer, laptop, TV, amplifier,projector Wireless Type:bluetooth WIFI Standard:2.4G High Definition Support:4K Sound Track:Single color:Black Material:plastic Package Contents: 1 x USB bluetooth adapter Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.