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, tablet, 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 connect wired headphones/speakers/headsets.5. Mini size: With anti-scratch process, the body is small and portable.Product Name: 4 IN 1 USB Bluetooth adapterProduct version: StandardProduct Model: K10 ProBluetooth Version: Bluetooth V5.1Chip:AC6951CTransmission Range: 10-20m ( free)Interface: 3.5mm AUXInput Parameter: DC 5V-2.1A(MAX)Support Protocol: A2DP/AVRCPProduct Dimension: about 40 x 18 x 10mmUsing : Drive freeProduct Weight:Standard version:15gSupport Devices: All kinds of speakers,desktop computer, laptop, TV, power amplifier,projectorWireless Type:bluetoothWIFI Standard:2.4GHigh Definition Support:4KSound Track:Singlecolor:BlackMaterial:plasticPackage Contents:1 x USB bluetooth adapterOnly the above package content, other products are not included.Note: Light 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.